Rename WebCore namespace to blink in Platform

Source/platform/PlatformInstrumentation.h

Index: Source/platform/PlatformInstrumentation.h
diff --git a/Source/platform/PlatformInstrumentation.h b/Source/platform/PlatformInstrumentation.h
index 2397dfe4e6272e39145ad2a874456ba72402f204..f12d4a324a7732a4021daf735cf9d3b50535726d 100644
--- a/Source/platform/PlatformInstrumentation.h
+++ b/Source/platform/PlatformInstrumentation.h
@@ -36,7 +36,7 @@
 #include "wtf/MainThread.h"
 #include "wtf/text/WTFString.h"
 
-namespace WebCore {
+namespace blink {
 
 class PLATFORM_EXPORT PlatformInstrumentationClient {
 public:
@@ -130,6 +130,6 @@ inline void PlatformInstrumentation::didDecodeLazyPixelRef()
     TRACE_EVENT_END0(CategoryName, DecodeLazyPixelRefEvent);
 }
 
-} // namespace WebCore
+} // namespace blink
 
 #endif // PlatformInstrumentation_h