Remove forward declarations of unused ImageRepGdk and ImageRepCairo

BUG=None
TEST=None
TBR=rsesek

Review URL: https://codereview.chromium.org/304443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272837 0039d316-1c4b-4281-b951-d872f2087c98

ui/gfx/image/image.cc

@@ -102,7 +102,6 @@ scoped_refptr<base::RefCountedMemory> Get1xPNGBytesFromImageSkia(
 
 class ImageRepPNG;
 class ImageRepSkia;
-class ImageRepGdk;
 class ImageRepCocoa;
 class ImageRepCocoaTouch;
 
@@ -697,11 +696,7 @@ void Image::SetSourceColorSpace(CGColorSpaceRef color_space) {
 
 Image::RepresentationType Image::DefaultRepresentationType() const {
   CHECK(storage_.get());
-  RepresentationType default_type = storage_->default_representation_type();
-  // The conversions above assume that the default representation type is never
-  // kImageRepCairo.
-  DCHECK_NE(default_type, kImageRepCairo);
-  return default_type;
+  return storage_->default_representation_type();
 }
 
 internal::ImageRep* Image::GetRepresentation(

ui/gfx/image/image.h

@@ -52,10 +52,8 @@ class ImageStorage;
 class GFX_EXPORT Image {
  public:
   enum RepresentationType {
-    kImageRepGdk,
     kImageRepCocoa,
     kImageRepCocoaTouch,
-    kImageRepCairo,
     kImageRepSkia,
     kImageRepPNG,
   };