Rename WebCore namespace to blink in Platform

Source/platform/testing/TreeTestHelpers.h

Index: Source/platform/testing/TreeTestHelpers.h
diff --git a/Source/platform/testing/TreeTestHelpers.h b/Source/platform/testing/TreeTestHelpers.h
index 73420b67413c4c6fa7814919085473d5d5c4aa76..5cad4f7054f7790e205a0428d02273d423cec430 100644
--- a/Source/platform/testing/TreeTestHelpers.h
+++ b/Source/platform/testing/TreeTestHelpers.h
@@ -33,7 +33,7 @@
 
 #include <stdint.h>
 
-namespace WebCore {
+namespace blink {
 namespace TreeTestHelpers {
 
 // Initializes the pseudo-random number generator with a specific seed.
@@ -45,6 +45,6 @@ void initRandom(const int32_t seed);
 int32_t nextRandom(const int32_t maximumValue);
 
 } // namespace TreeTestHelpers
-} // namespace WebCore
+} // namespace blink
 
 #endif // TreeTestHelpers_h