Fix front-end host creation upon navigation

chrome/browser/devtools/devtools_ui_bindings.h

Index: chrome/browser/devtools/devtools_ui_bindings.h
diff --git a/chrome/browser/devtools/devtools_ui_bindings.h b/chrome/browser/devtools/devtools_ui_bindings.h
index 22939c4de8cd84c3090b953ad522cbd30c098eee..ba71f14694671461ae9969b11933af48b4ff430b 100644
--- a/chrome/browser/devtools/devtools_ui_bindings.h
+++ b/chrome/browser/devtools/devtools_ui_bindings.h
@@ -29,7 +29,7 @@ class Profile;
 class PortForwardingStatusSerializer;
 
 namespace content {
-struct FileChooserParams;
+class NavigationHandle;
 class WebContents;
 }
 
@@ -43,6 +43,9 @@ class DevToolsUIBindings : public DevToolsEmbedderMessageDispatcher::Delegate,
   static DevToolsUIBindings* ForWebContents(
       content::WebContents* web_contents);
 
+  static GURL SanitizeFrontendURL(const GURL& url);
+  static bool IsValidFrontendURL(const GURL& url);
+
   class Delegate {
    public:
     virtual ~Delegate() {}
@@ -199,6 +202,7 @@ class DevToolsUIBindings : public DevToolsEmbedderMessageDispatcher::Delegate,
   typedef base::Callback<void(bool)> InfoBarCallback;
   void ShowDevToolsConfirmInfoBar(const base::string16& message,
                                   const InfoBarCallback& callback);
+  void UpdateFrontendHost(content::NavigationHandle* navigation_handle);
 
   // Extensions support.
   void AddDevToolsExtensionsToClient();