Rename WebKit namespace to blink

Source/core/platform/graphics/gpu/DrawingBufferTest.cpp

Index: Source/core/platform/graphics/gpu/DrawingBufferTest.cpp
diff --git a/Source/core/platform/graphics/gpu/DrawingBufferTest.cpp b/Source/core/platform/graphics/gpu/DrawingBufferTest.cpp
index 29e54b47e222af4e83c5283e5a08abb7a4a066e3..f7a0009484fe5541aeab15df880b7faab6e8dbb3 100644
--- a/Source/core/platform/graphics/gpu/DrawingBufferTest.cpp
+++ b/Source/core/platform/graphics/gpu/DrawingBufferTest.cpp
@@ -41,7 +41,7 @@
 #include <gtest/gtest.h>
 
 using namespace WebCore;
-using namespace WebKit;
+using namespace blink;
 using testing::Test;
 using testing::_;
 
@@ -76,7 +76,7 @@ TEST_F(DrawingBufferTest, verifyNoNewBuffersAfterContextLostWithMailboxes)
     m_drawingBuffer->markContentsChanged();
     m_drawingBuffer->releaseResources();
 
-    WebKit::WebExternalTextureMailbox mailbox;
+    blink::WebExternalTextureMailbox mailbox;
     EXPECT_FALSE(m_drawingBuffer->prepareMailbox(&mailbox, 0));
 }