Replace kGAD constants. (#539)

Author: jjliu15

packages/google_mobile_ads/ios/Classes/FLTAd_Internal.m

@@ -155,7 +155,7 @@ - (instancetype _Nonnull)initWithOrientation:(NSString *_Nonnull)orientation {
 
 @implementation FLTFluidSize
 - (instancetype _Nonnull)init {
-  self = [self initWithAdSize:kGADAdSizeFluid];
+  self = [self initWithAdSize:GADAdSizeFluid];
   return self;
 }
 @end
@@ -497,7 +497,7 @@ - (instancetype)initWithAdUnitId:(NSString *_Nonnull)adUnitId
     _height = -1;
     _adRequest = request;
     _adUnitId = adUnitId;
-    _bannerView = [[GAMBannerView alloc] initWithAdSize:kGADAdSizeFluid];
+    _bannerView = [[GAMBannerView alloc] initWithAdSize:GADAdSizeFluid];
     _bannerView.adUnitID = adUnitId;
     _bannerView.rootViewController = rootViewController;
     _bannerView.appEventDelegate = self;
@@ -1086,7 +1086,7 @@ @implementation FLTNativeAd {
     _adLoader =
         [[GADAdLoader alloc] initWithAdUnitID:_adUnitId
                            rootViewController:rootViewController
-                                      adTypes:@[ kGADAdLoaderAdTypeNative ]
+                                      adTypes:@[ GADAdLoaderAdTypeNative ]
                                       options:adLoaderOptions];
     _nativeAdOptions = nativeAdOptions;
     self.adLoader.delegate = self;

packages/google_mobile_ads/ios/Tests/FLTFluidGAMBannerAdTest.m

@@ -120,7 +120,7 @@ - (void)testPlatformViewSetup {
 
   id gamBannerClassMock = OCMClassMock([GAMBannerView class]);
   OCMStub([gamBannerClassMock alloc]).andReturn(gamBannerClassMock);
-  OCMStub([gamBannerClassMock initWithAdSize:kGADAdSizeFluid])
+  OCMStub([gamBannerClassMock initWithAdSize:GADAdSizeFluid])
       .andReturn(gamBannerClassMock);
 
   // Create and load an ad.

packages/google_mobile_ads/ios/Tests/FLTGoogleMobileAdsReaderWriterTest.m

@@ -244,11 +244,8 @@ - (void)testEncodeDecodeFluidAdSize {
   FLTFluidSize *decodedSize = [_messageCodec decode:encodedMessage];
 
   XCTAssertTrue([decodedSize isKindOfClass:FLTFluidSize.class]);
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
-  XCTAssertEqual(decodedSize.size.size.width, kGADAdSizeFluid.size.width);
-  XCTAssertEqual(decodedSize.size.size.height, kGADAdSizeFluid.size.height);
-#pragma clang diagnostic pop
+  XCTAssertEqual(decodedSize.size.size.width, GADAdSizeFluid.size.width);
+  XCTAssertEqual(decodedSize.size.size.height, GADAdSizeFluid.size.height);
 }
 
 - (void)testEncodeDecodeAdRequest {