Use correct favicon scale factor on Android.

ui/gfx/android/java_bitmap.h

Index: ui/gfx/android/java_bitmap.h
diff --git a/ui/gfx/android/java_bitmap.h b/ui/gfx/android/java_bitmap.h
index 061bb76e537e740767947b183482e873f0c63b39..ac01653f76cf1d400cbaf24ec75065c374147a38 100644
--- a/ui/gfx/android/java_bitmap.h
+++ b/ui/gfx/android/java_bitmap.h
@@ -5,6 +5,8 @@
 #ifndef UI_GFX_ANDROID_JAVA_BITMAP_H_
 #define UI_GFX_ANDROID_JAVA_BITMAP_H_
 
+#include <jni.h>
+
 #include "base/android/scoped_java_ref.h"
 #include "ui/gfx/size.h"
 
@@ -26,6 +28,9 @@ class UI_EXPORT JavaBitmap {
   inline int format() const { return format_; }
   inline uint32_t stride() const { return stride_; }
 
+  // Registers methods with JNI and returns true if succeeded.
+  static bool RegisterJavaBitmap(JNIEnv* env);
+
  private:
   jobject bitmap_;
   void* pixels_;