Remove unused globalRef/globalUnref.

BUG=skia:1482

Review URL: https://codereview.chromium.org/887993003

include/core/SkPixelRef.h

@@ -264,22 +264,6 @@ public:
         return NULL;
     }
 
-#ifdef SK_BUILD_FOR_ANDROID
-    /**
-     *  Acquire a "global" ref on this object.
-     *  The default implementation just calls ref(), but subclasses can override
-     *  this method to implement additional behavior.
-     */
-    virtual void globalRef(void* data=NULL);
-
-    /**
-     *  Release a "global" ref on this object.
-     *  The default implementation just calls unref(), but subclasses can override
-     *  this method to implement additional behavior.
-     */
-    virtual void globalUnref();
-#endif
-
     // Register a listener that may be called the next time our generation ID changes.
     //
     // We'll only call the listener if we're confident that we are the only SkPixelRef with this

src/core/SkPixelRef.cpp

@@ -272,14 +272,3 @@ size_t SkPixelRef::getAllocatedSizeInBytes() const {
     return 0;
 }
 
-///////////////////////////////////////////////////////////////////////////////
-
-#ifdef SK_BUILD_FOR_ANDROID
-void SkPixelRef::globalRef(void* data) {
-    this->ref();
-}
-
-void SkPixelRef::globalUnref() {
-    this->unref();
-}
-#endif