Rename WebCore namespace to blink in Platform

Source/platform/graphics/CompositingReasons.h

Index: Source/platform/graphics/CompositingReasons.h
diff --git a/Source/platform/graphics/CompositingReasons.h b/Source/platform/graphics/CompositingReasons.h
index 0d37a97d96c86eb5eb55104c19cd0a6c030cd48c..29cb6f687fe4ce00ab4e48ecd608e4df4e0d5aaa 100644
--- a/Source/platform/graphics/CompositingReasons.h
+++ b/Source/platform/graphics/CompositingReasons.h
@@ -9,7 +9,7 @@
 #include "wtf/MathExtras.h"
 #include <stdint.h>
 
-namespace WebCore {
+namespace blink {
 
 const uint64_t CompositingReasonNone                                     = 0;
 const uint64_t CompositingReasonAll                                      = ~static_cast<uint64_t>(0);
@@ -184,6 +184,6 @@ struct CompositingReasonStringMap {
 PLATFORM_EXPORT extern const CompositingReasonStringMap kCompositingReasonStringMap[];
 PLATFORM_EXPORT extern size_t kNumberOfCompositingReasons;
 
-} // namespace WebCore
+} // namespace blink
 
 #endif // CompositingReasons_h