Cleanup namespace usage in public/platform/Web[A-M]*.h.

public/platform/WebIDBMetadata.h

Index: public/platform/WebIDBMetadata.h
diff --git a/public/platform/WebIDBMetadata.h b/public/platform/WebIDBMetadata.h
index afa637e46fb0fd440e087e5a46c2c43d766d105f..5f2e9134c3ed898b42617e7c8c30d5c2de34c7ab 100644
--- a/public/platform/WebIDBMetadata.h
+++ b/public/platform/WebIDBMetadata.h
@@ -32,10 +32,8 @@
 #include "WebVector.h"
 
 namespace blink {
-struct IDBDatabaseMetadata;
-}
 
-namespace blink {
+struct IDBDatabaseMetadata;
 
 struct WebIDBMetadata {
     enum {
@@ -81,12 +79,11 @@ struct WebIDBMetadata {
     };
 
 #if BLINK_IMPLEMENTATION
-    WebIDBMetadata(const blink::IDBDatabaseMetadata&);
-    operator blink::IDBDatabaseMetadata() const;
+    WebIDBMetadata(const IDBDatabaseMetadata&);
+    operator IDBDatabaseMetadata() const;
 #endif
 };
 
-
 } // namespace blink
 
 #endif // WebIDBMetadata_h