Use std::string instead of WTF::String / TextStream

cc/CCLayerTreeHostImpl.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CCLayerTreeHostImpl_h
 #define CCLayerTreeHostImpl_h
 
 #include "CCAnimationEvents.h"
 #include "CCInputHandler.h"
 #include "CCLayerSorter.h"
@@ skipping 86 matching lines @@
     virtual void releaseContentsTextures() OVERRIDE;
     virtual void setMemoryAllocationLimitBytes(size_t) OVERRIDE;
 
     // WebCompositorOutputSurfaceClient implementation.
     virtual void onVSyncParametersChanged(double monotonicTimebase, double intervalInSeconds) OVERRIDE;
 
     // Implementation
     bool canDraw();
     CCGraphicsContext* context() const;
 
-    String layerTreeAsText() const;
+    std::string layerTreeAsText() const;
 
     void finishAllRendering();
     int sourceAnimationFrameNumber() const;
 
     bool initializeRenderer(PassOwnPtr<CCGraphicsContext>, TextureUploaderOption);
     bool isContextLost();
     CCRenderer* renderer() { return m_renderer.get(); }
     const RendererCapabilities& rendererCapabilities() const;
 
     bool swapBuffers();
@@ skipping 117 matching lines @@
     void setBackgroundTickingEnabled(bool);
     IntSize contentSize() const;
 
     void sendDidLoseContextRecursive(CCLayerImpl*);
     void clearRenderSurfaces();
     bool ensureRenderSurfaceLayerList();
     void clearCurrentlyScrollingLayer();
 
     void animateScrollbarsRecursive(CCLayerImpl*, double monotonicTime);
 
-    void dumpRenderSurfaces(TextStream&, int indent, const CCLayerImpl*) const;
+    void dumpRenderSurfaces(std::string*, int indent, const CCLayerImpl*) const;
 
     OwnPtr<CCGraphicsContext> m_context;
     OwnPtr<CCResourceProvider> m_resourceProvider;
     OwnPtr<CCRenderer> m_renderer;
     OwnPtr<CCLayerImpl> m_rootLayerImpl;
     CCLayerImpl* m_rootScrollLayerImpl;
     CCLayerImpl* m_currentlyScrollingLayerImpl;
     CCHeadsUpDisplayLayerImpl* m_hudLayerImpl;
     int m_scrollingLayerIdFromPreviousTree;
     bool m_scrollDeltaIsInScreenSpace;
@@ skipping 29 matching lines @@
     // rendering and input event hit testing.
     CCLayerList m_renderSurfaceLayerList;
 
     OwnPtr<CCFrameRateCounter> m_fpsCounter;
     OwnPtr<CCDebugRectHistory> m_debugRectHistory;
 };
 
 };
 
 #endif