Cleanup namespace usage in Source/web/Web*.h

Source/web/WebDevToolsAgentPrivate.h

Index: Source/web/WebDevToolsAgentPrivate.h
diff --git a/Source/web/WebDevToolsAgentPrivate.h b/Source/web/WebDevToolsAgentPrivate.h
index 011d0aa3471c43806a76e603442db7d305d1acb3..34edcc6c1087814d419a88dc2abac46e17cd2b28 100644
--- a/Source/web/WebDevToolsAgentPrivate.h
+++ b/Source/web/WebDevToolsAgentPrivate.h
@@ -34,10 +34,8 @@
 #include "public/web/WebDevToolsAgent.h"
 
 namespace blink {
-class Page;
-}
 
-namespace blink {
+class Page;
 class WebLocalFrameImpl;
 class WebInputEvent;
 struct WebSize;
@@ -52,7 +50,7 @@ public:
     virtual void didCreateScriptContext(WebLocalFrameImpl*, int worldId) = 0;
 
     // DevTools may handle input event from WebViewImpl.
-    virtual bool handleInputEvent(blink::Page*, const WebInputEvent&) = 0;
+    virtual bool handleInputEvent(Page*, const WebInputEvent&) = 0;
 
     // Notification from WebViewImpl after layout.
     virtual void didLayout() = 0;