Cleanup namespace usage in platform/graphics/[filters/* to skia/*] and platform/graphics/[B-D]*

Source/platform/graphics/DiscardablePixelRef.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 64 matching lines @@
     , m_rowBytes(rowBytes)
 {
 }
 
 DiscardablePixelRef::~DiscardablePixelRef()
 {
 }
 
 bool DiscardablePixelRef::allocAndLockDiscardableMemory(size_t bytes)
 {
-    m_discardable = adoptPtr(blink::Platform::current()->allocateAndLockDiscardableMemory(bytes));
+    m_discardable = adoptPtr(Platform::current()->allocateAndLockDiscardableMemory(bytes));
     if (m_discardable) {
         m_lockedMemory = m_discardable->data();
         return true;
     }
     return false;
 }
 
 bool DiscardablePixelRef::onNewLockPixels(LockRec* rec)
 {
     if (!m_lockedMemory && m_discardable->lock())
@@ skipping 14 matching lines @@
         m_discardable->unlock();
     m_lockedMemory = 0;
 }
 
 bool DiscardablePixelRef::isDiscardable(SkPixelRef* pixelRef)
 {
     return pixelRef && pixelRef->getURI() && !strcmp(pixelRef->getURI(), labelDiscardable);
 }
 
 } // namespace blink