Use travis for Xcode 11 testing (#7032)

Author: paulb777

.travis.yml

@@ -25,7 +25,6 @@ jobs:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseCoreDiagnostics.podspec --platforms=macos
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Core METHOD=pod-lib-lint
       script:
@@ -45,56 +44,48 @@ jobs:
         - travis_retry ./scripts/pod_lib_lint.rb FirebaseCoreDiagnostics.podspec --platforms=macos --use-modular-headers
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=ABTesting METHOD=pod-lib-lint
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseABTesting.podspec --platforms=ios
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Auth PLATFORM=iOS METHOD=xcodebuild
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseAuth.podspec --platforms=ios
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=InstanceID METHOD=pod-lib-lint
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseInstanceID.podspec --platforms=ios
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Database PLATFORM=all METHOD=xcodebuild
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseDatabase.podspec --skip-tests --platforms=ios
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=DynamicLinks METHOD=pod-lib-lint
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseDynamicLinks.podspec
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Messaging METHOD=pod-lib-lint
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseMessaging.podspec --platforms=ios
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=RemoteConfig METHOD=pod-lib-lint
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseRemoteConfig.podspec --platforms=ios --skip-tests
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Storage PLATFORM=all METHOD=xcodebuild
       script:
@@ -107,21 +98,8 @@ jobs:
         - ./scripts/if_changed.sh ./scripts/install_prereqs.sh # Start integration test server
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseFunctions.podspec
-        - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseFunctions.podspec --use-static-frameworks
-        - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseFunctions.podspec --use-libraries
-        - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseFunctions.podspec --use-modular-headers
 
     - stage: test
-      osx_image: xcode10.3
-      env:
-        - PROJECT=Functions METHOD=pod-lib-lint
-      before_install:
-        - ./scripts/if_changed.sh ./scripts/install_prereqs.sh # Start integration test server
-      script:
-        - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb FirebaseFunctions.podspec
-
-    - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Crashlytics METHOD=pod-lib-lint
       script:
@@ -136,7 +114,6 @@ jobs:
         - travis_retry ./scripts/if_changed.sh ./scripts/build.sh $PROJECT $PLATFORM
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=InAppMessaging PLATFORM=iOS METHOD=xcodebuild
       before_install:
@@ -154,7 +131,6 @@ jobs:
         - travis_retry ./scripts/if_changed.sh ./scripts/build.sh $PROJECT $PLATFORM
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=Firestore PLATFORM=iOS METHOD=xcodebuild
       before_install:
@@ -169,7 +145,6 @@ jobs:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb GoogleUtilities.podspec
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=GoogleUtilities METHOD=pod-lib-lint
       script:
@@ -199,13 +174,6 @@ jobs:
       script:
         - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb GoogleUtilitiesComponents.podspec
 
-    - stage: test
-      osx_image: xcode10.3
-      env:
-        - PROJECT=GoogleUtilitiesComponents METHOD=pod-lib-lint
-      script:
-        - travis_retry ./scripts/if_changed.sh ./scripts/pod_lib_lint.rb GoogleUtilitiesComponents.podspec
-
     - stage: test
       if: type = cron
       env:
@@ -231,7 +199,6 @@ jobs:
         - travis_retry ./scripts/pod_lib_lint.rb FirebaseInAppMessaging.podspec --use-modular-headers
 
     - stage: test
-      osx_image: xcode10.3
       env:
         - PROJECT=GoogleDataTransport METHOD=pod-lib-lint
       script:
@@ -268,4 +235,3 @@ jobs:
 branches:
   only:
     - master
-    - firebase7-main