Remove app_spec from GDT (#3825)

Fixes #3824

Author: mikehaney24

GoogleDataTransport.podspec

@@ -42,18 +42,17 @@ Shared library for iOS SDK data transport needs.
   common_test_sources = ['GoogleDataTransport/GDTCORTests/Common/**/*.{h,m}']
 
   # Test app specs
-  s.app_spec 'TestApp' do |app_spec|
-    app_spec.source_files = 'GoogleDataTransport/GDTTestApp/*.swift'
-    app_spec.ios.resources = ['GoogleDataTransport/GDTTestApp/ios/*.storyboard']
-    app_spec.macos.resources = ['GoogleDataTransport/GDTTestApp/macos/*.storyboard']
-    app_spec.tvos.resources = ['GoogleDataTransport/GDTTestApp/tvos/*.storyboard']
-    # TODO(mikehaney24): Uncomment when travis is running >= cocoapods-1.8.0
-    #app_spec.info_plist = {
-    #  'UILaunchStoryboardName' => 'Main',
-    #  'UIMainStoryboardFile' => 'Main',
-    #  'NSMainStoryboardFile' => 'Main'
-    #}
-  end
+  #s.app_spec 'TestApp' do |app_spec|
+  #  app_spec.source_files = 'GoogleDataTransport/GDTTestApp/*.swift'
+  #  app_spec.ios.resources = ['GoogleDataTransport/GDTTestApp/ios/*.storyboard']
+  #  app_spec.macos.resources = ['GoogleDataTransport/GDTTestApp/macos/*.storyboard']
+  #  app_spec.tvos.resources = ['GoogleDataTransport/GDTTestApp/tvos/*.storyboard']
+  #  app_spec.info_plist = {
+  #    'UILaunchStoryboardName' => 'Main',
+  #    'UIMainStoryboardFile' => 'Main',
+  #    'NSMainStoryboardFile' => 'Main'
+  #  }
+  #end
 
   # Unit test specs
   s.test_spec 'Tests-Unit' do |test_spec|