Implement unregisterProtocolHandler() function on CUSTOM_SCHEME_HANDLER

Source/web/ChromeClientImpl.h

Index: Source/web/ChromeClientImpl.h
diff --git a/Source/web/ChromeClientImpl.h b/Source/web/ChromeClientImpl.h
index 639e9d9550b9e16372a3dfb97afff3f407d14e3f..49623ed607e7d9b0246fb9e874e4d95832972e28 100644
--- a/Source/web/ChromeClientImpl.h
+++ b/Source/web/ChromeClientImpl.h
@@ -208,6 +208,10 @@ public:
     ~NavigatorContentUtilsClientImpl() { }
 
     virtual void registerProtocolHandler(const String& scheme, const String& baseURL, const String& url, const String& title) OVERRIDE;
+#if ENABLE(CUSTOM_SCHEME_HANDLER)

[abarth-chromium, 2013/08/15 20:05:49]

We no longer use #ifdefs to scope in-progress feature development.  Instead, we
use RuntimeEnabledFeatures.in.

[gyuyoung-inactive, 2013/08/16 07:07:13]

Thank you for pointing it out. I try to use RuntimeEnabledFeatures.in to support
this feature. But, I'm not sure if I don't missing something to do. Please take
a look again.

+    CustomHandlersState isProtocolHandlerRegistered(const String& scheme, const String& baseURL, const String& url) OVERRIDE;
+    virtual void unregisterProtocolHandler(const String& scheme, const String& baseURL, const String& url) OVERRIDE;
+#endif
 
 private:
     explicit NavigatorContentUtilsClientImpl(WebViewImpl*);