Revert "Frameworks/base: Mask Skia warning in GraphicsJNI"

Should be unnecessary after c/115476.
This reverts commit ba823cee8b.

Change-Id: I3ef4d3e04805e450038d469d9672dc064f729b0f

core/jni/android/graphics/GraphicsJNI.h

@@ -1,8 +1,6 @@
 #ifndef GraphicsJNI_DEFINED
 #define GraphicsJNI_DEFINED
 
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-parameter"
 #include "SkBitmap.h"
 #include "SkDevice.h"
 #include "SkPixelRef.h"
@@ -10,8 +8,6 @@
 #include "SkPoint.h"
 #include "SkRect.h"
 #include "SkImageDecoder.h"
-#pragma GCC diagnostic pop
-
 #include <jni.h>
 
 class SkBitmapRegionDecoder;