Cleanup namespace usage from animation to exported in platform/

Source/platform/exported/WebURLRequestPrivate.h

Index: Source/platform/exported/WebURLRequestPrivate.h
diff --git a/Source/platform/exported/WebURLRequestPrivate.h b/Source/platform/exported/WebURLRequestPrivate.h
index 9aaa18d129099e3a5a82cca7e2a4e0f1387d13d0..c6261c572eedff255a2b50fc7acb69cc7ddfcbcd 100644
--- a/Source/platform/exported/WebURLRequestPrivate.h
+++ b/Source/platform/exported/WebURLRequestPrivate.h
@@ -31,10 +31,10 @@
 #ifndef WebURLRequestPrivate_h
 #define WebURLRequestPrivate_h
 
-namespace blink { class ResourceRequest; }
-
 namespace blink {
 
+class ResourceRequest;
+
 class WebURLRequestPrivate {
 public:
     WebURLRequestPrivate()
@@ -45,7 +45,7 @@ public:
     // Called by WebURLRequest when it no longer needs this object.
     virtual void dispose() = 0;
 
-    blink::ResourceRequest* m_resourceRequest;
+    ResourceRequest* m_resourceRequest;
 };
 
 } // namespace blink