Restore CefRenderProcessHandler::OnBeforeNavigation (issue #1076). This method is still needed for some use cases due to issue #1129.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1519 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/cef_render_process_handler.h

@@ -55,6 +55,8 @@
 /*--cef(source=client)--*/
 class CefRenderProcessHandler : public virtual CefBase {
  public:
+  typedef cef_navigation_type_t NavigationType;
+
   ///
   // Called after the render process main thread has been created. |extra_info|
   // is a read-only value originating from
@@ -92,6 +94,18 @@ class CefRenderProcessHandler : public virtual CefBase {
     return NULL;
   }
 
+  ///
+  // Called before browser navigation. Return true to cancel the navigation or
+  // false to allow the navigation to proceed. The |request| object cannot be
+  // modified in this callback.
+  ///
+  /*--cef()--*/
+  virtual bool OnBeforeNavigation(CefRefPtr<CefBrowser> browser,
+                                  CefRefPtr<CefFrame> frame,
+                                  CefRefPtr<CefRequest> request,
+                                  NavigationType navigation_type,
+                                  bool is_redirect) { return false; }
+
   ///
   // Called immediately after the V8 context for a frame has been created. To
   // retrieve the JavaScript 'window' object use the CefV8Context::GetGlobal()