Clean up forward declarations in Source/modules

Source/modules/credentialmanager/Credential.h

Index: Source/modules/credentialmanager/Credential.h
diff --git a/Source/modules/credentialmanager/Credential.h b/Source/modules/credentialmanager/Credential.h
index 5e195eeb27e3c6812c47b188bad14dd27b3f0bd9..d52f705d4c2796709e7ee7eedc706cd9acbbafb7 100644
--- a/Source/modules/credentialmanager/Credential.h
+++ b/Source/modules/credentialmanager/Credential.h
@@ -6,14 +6,11 @@
 #define Credential_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
-#include "bindings/core/v8/SerializedScriptValue.h"
 #include "platform/credentialmanager/PlatformCredential.h"
-#include "platform/heap/Handle.h"

[Mike West, 2014/10/11 10:53:05]

Dropping Handle.h here seems wrong; the class is GarbageCollected, (defined in
Heap.h, which Handle.h includes, and uses Member<> (defined in Handle.h).

[zhaoze.zhou, 2014/10/13 16:51:00]

Done.

 #include "platform/weborigin/KURL.h"
 
 namespace blink {
 
-class WebCredential;
 class ExceptionState;
 
 class Credential : public GarbageCollected<Credential>, public ScriptWrappable {