Fix ODR violation in Blink

third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
index 84cbb6f88c12ecce14389118160bc4237ab980d2..e7caecf5debcdb0b36cf7cff071c619f796ed92b 100644
--- a/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/ImageBuffer.cpp
@@ -495,6 +495,8 @@ void ImageBuffer::updateGPUMemoryUsage() const {
   }
 }
 
+namespace {
+
 class UnacceleratedSurfaceFactory
     : public RecordingImageBufferFallbackSurfaceFactory {
  public:
@@ -511,6 +513,8 @@ class UnacceleratedSurfaceFactory
   virtual ~UnacceleratedSurfaceFactory() {}
 };
 
+}  // namespace
+
 void ImageBuffer::disableAcceleration() {
   if (!isAccelerated())
     return;