Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/platform/graphics/GraphicsContext.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * 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
@@ skipping 122 matching lines @@
     , m_antialiasHairlineImages(false)
 {
     // FIXME: Do some tests to determine how many states are typically used, and allocate
     // several here.
     m_paintStateStack.append(GraphicsContextState::create());
     m_paintState = m_paintStateStack.last().get();
 }
 
 GraphicsContext::~GraphicsContext()
 {
+#if !ENABLE(OILPAN)
+    // These asserts are only valid in debug mode and therefore do not seem
+    // useful. We cannot rely on them in any case. With Oilpan we cannot run
+    // the debug mode only code in CanvasRendingContext2D's destructor which
+    // touches other objects that are dead. Therefore, we disable these asserts
+    // with Oilpan and should probably consider just disabling them.
     ASSERT(!m_paintStateIndex);
     ASSERT(!m_paintState->saveCount());
     ASSERT(!m_annotationCount);
     ASSERT(!m_layerCount);
     ASSERT(m_recordingStateStack.isEmpty());
+#endif
 }
 
 void GraphicsContext::save()
 {
     if (paintingDisabled())
         return;
 
     m_paintState->incrementSaveCount();
 
     m_canvasStateStack.append(CanvasSaveState(m_pendingCanvasSave, m_canvas->getSaveCount()));
@@ skipping 1717 matching lines @@
 
 void GraphicsContext::didDrawTextInRect(const SkRect& textRect)
 {
     if (m_trackTextRegion) {
         TRACE_EVENT0("skia", "PlatformContextSkia::trackTextRegion");
         m_textRegion.join(textRect);
     }
 }
 
 }