cros: Bind hangup red button on remote controller to close web dialog

ui/views/controls/webview/web_dialog_view.h

Index: ui/views/controls/webview/web_dialog_view.h
diff --git a/ui/views/controls/webview/web_dialog_view.h b/ui/views/controls/webview/web_dialog_view.h
index 6ece059d701ad3acc10f57309972673ca8ce1b5a..00be6467d134c2f7e4a7271b7205c216aeafe283 100644
--- a/ui/views/controls/webview/web_dialog_view.h
+++ b/ui/views/controls/webview/web_dialog_view.h
@@ -143,21 +143,21 @@ class WEBVIEW_EXPORT WebDialogView : public views::ClientView,
 
   // Whether user is attempting to close the dialog and we are processing
   // beforeunload event.
-  bool is_attempting_close_dialog_;
+  bool is_attempting_close_dialog_ = false;
 
   // Whether beforeunload event has been fired and we have finished processing
   // beforeunload event.
-  bool before_unload_fired_;
+  bool before_unload_fired_ = false;
 
   // Whether the dialog is closed from WebUI in response to a "dialogClose"
   // message.
-  bool closed_via_webui_;
+  bool closed_via_webui_ = false;
 
   // A json string returned to WebUI from a "dialogClose" message.
   std::string dialog_close_retval_;
 
   // Whether CloseContents() has been called.
-  bool close_contents_called_;
+  bool close_contents_called_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WebDialogView);
 };