Rename WebCore namespace to blink in Platform

Source/platform/graphics/ImageBuffer.cpp

Index: Source/platform/graphics/ImageBuffer.cpp
diff --git a/Source/platform/graphics/ImageBuffer.cpp b/Source/platform/graphics/ImageBuffer.cpp
index e8ee49e8031ee9b1cc80e4fc4abc0357f639bd5b..e699db0c1584b5fa801252f98748fc13e8986e5d 100644
--- a/Source/platform/graphics/ImageBuffer.cpp
+++ b/Source/platform/graphics/ImageBuffer.cpp
@@ -59,7 +59,7 @@
 
 using namespace std;
 
-namespace WebCore {
+namespace blink {
 
 PassOwnPtr<ImageBuffer> ImageBuffer::create(PassOwnPtr<ImageBufferSurface> surface)
 {
@@ -421,4 +421,4 @@ String ImageDataToDataURL(const ImageDataBuffer& imageData, const String& mimeTy
     return "data:" + mimeType + ";base64," + base64Data;
 }
 
-} // namespace WebCore
+} // namespace blink