Remove WEBP encoder SkBitmap API

Source/platform/image-encoders/skia/WEBPImageEncoder.h

Index: Source/platform/image-encoders/skia/WEBPImageEncoder.h
diff --git a/Source/platform/image-encoders/skia/WEBPImageEncoder.h b/Source/platform/image-encoders/skia/WEBPImageEncoder.h
index 637bfbe3827bcb3e30dc14c25db096489bfbe899..3a0e9c2df4735161dceeeb3f66c98b0315c91583 100644
--- a/Source/platform/image-encoders/skia/WEBPImageEncoder.h
+++ b/Source/platform/image-encoders/skia/WEBPImageEncoder.h
@@ -33,8 +33,6 @@
 
 #include "wtf/Vector.h"
 
-class SkBitmap;
-
 namespace blink {
 
 struct ImageDataBuffer;
@@ -42,7 +40,6 @@ struct ImageDataBuffer;
 class WEBPImageEncoder {
 public:
     // Encode the input data with a compression quality in [0-100].
-    static bool encode(const SkBitmap&, int quality, Vector<unsigned char>*);
     static bool encode(const ImageDataBuffer&, int quality, Vector<unsigned char>*);
 
     // For callers: provide a reasonable compression quality default.