Replacing the OVERRIDE with override in third_party/WebKit/Source/platform

Source/platform/image-decoders/png/PNGImageDecoder.h

Index: Source/platform/image-decoders/png/PNGImageDecoder.h
diff --git a/Source/platform/image-decoders/png/PNGImageDecoder.h b/Source/platform/image-decoders/png/PNGImageDecoder.h
index 1b7339634120388c7585c8acdc08f6a1d2dd3236..8232602d30605c2507b58c091a7d46a9605e90ca 100644
--- a/Source/platform/image-decoders/png/PNGImageDecoder.h
+++ b/Source/platform/image-decoders/png/PNGImageDecoder.h
@@ -42,14 +42,14 @@ public:
     virtual ~PNGImageDecoder();
 
     // ImageDecoder
-    virtual String filenameExtension() const OVERRIDE { return "png"; }
-    virtual bool isSizeAvailable() OVERRIDE;
-    virtual bool hasColorProfile() const OVERRIDE { return m_hasColorProfile; }
-    virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE;
+    virtual String filenameExtension() const override { return "png"; }
+    virtual bool isSizeAvailable() override;
+    virtual bool hasColorProfile() const override { return m_hasColorProfile; }
+    virtual ImageFrame* frameBufferAtIndex(size_t) override;
     // CAUTION: setFailed() deletes |m_reader|.  Be careful to avoid
     // accessing deleted memory, especially when calling this from inside
     // PNGImageReader!
-    virtual bool setFailed() OVERRIDE;
+    virtual bool setFailed() override;
 
     // Callbacks from libpng
     void headerAvailable();