Fix unit test style in Source/platform/, part 2.

Source/platform/graphics/Canvas2DLayerManager.h

Index: Source/platform/graphics/Canvas2DLayerManager.h
diff --git a/Source/platform/graphics/Canvas2DLayerManager.h b/Source/platform/graphics/Canvas2DLayerManager.h
index e357bcc86fb152ffb5ef3742afa671a9f944f979..eb52c66646a5086ef7dcb688d3f008207d3329fc 100644
--- a/Source/platform/graphics/Canvas2DLayerManager.h
+++ b/Source/platform/graphics/Canvas2DLayerManager.h
@@ -28,10 +28,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "platform/graphics/Canvas2DLayerBridge.h"
 #include "public/platform/WebThread.h"
 
-class Canvas2DLayerManagerTest;
-
 namespace blink {
 
+class Canvas2DLayerManagerTest;
+
 class PLATFORM_EXPORT Canvas2DLayerManager : public WebThread::TaskObserver {
 public:
     static Canvas2DLayerManager& get();
@@ -58,7 +58,7 @@ private:
     bool m_taskObserverActive;
     DoublyLinkedList<Canvas2DLayerBridge> m_layerList;
 
-    friend class ::Canvas2DLayerManagerTest; // for unit testing
+    friend class Canvas2DLayerManagerTest; // for unit testing
 };
 
 } // namespace blink