Cleanup namespace usage from animation to exported in platform/

Source/platform/audio/HRTFDatabaseLoader.h

Index: Source/platform/audio/HRTFDatabaseLoader.h
diff --git a/Source/platform/audio/HRTFDatabaseLoader.h b/Source/platform/audio/HRTFDatabaseLoader.h
index 5d17a21cbe825b83021c195c00924703f1b58776..50e9e84c7816bfb55fded81c1e27c1b046619016 100644
--- a/Source/platform/audio/HRTFDatabaseLoader.h
+++ b/Source/platform/audio/HRTFDatabaseLoader.h
@@ -83,7 +83,7 @@ private:
 
     // Holding a m_threadLock is required when accessing m_databaseLoaderThread since we access it from multiple threads.
     Mutex m_threadLock;
-    OwnPtr<blink::WebThread> m_databaseLoaderThread;
+    OwnPtr<WebThread> m_databaseLoaderThread;
 
     float m_databaseSampleRate;
 };