Call GetBrowser() from RenderViewContextMenu::IsRouteMediaEnabled()

chrome/browser/renderer_context_menu/render_view_context_menu.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 2080 matching lines @@
   }
 
   Browser* browser = GetBrowser();
   return browser && chrome::CanPrint(browser);
 }
 
 bool RenderViewContextMenu::IsRouteMediaEnabled() const {
   if (!media_router::MediaRouterEnabled(browser_context_))
     return false;
 
-  Browser* browser = chrome::FindBrowserWithWebContents(source_web_contents_);
+  Browser* browser = GetBrowser();
   if (!browser)
     return false;
 
   // Disable the command if there is an active modal dialog.
   // We don't use |source_web_contents_| here because it could be the
   // WebContents for something that's not the current tab (e.g., WebUI
   // modal dialog).
   WebContents* web_contents =
       browser->tab_strip_model()->GetActiveWebContents();
   if (!web_contents)
@@ skipping 258 matching lines @@
       GetPrefs(browser_context_)->GetBoolean(prefs::kPrintPreviewDisabled),
       !params_.selection_text.empty());
 #endif  // defined(ENABLE_PRINTING)
 }
 
 void RenderViewContextMenu::ExecRouteMedia() {
 #if defined(ENABLE_MEDIA_ROUTER)
   if (!media_router::MediaRouterEnabled(browser_context_))
     return;
 
   Browser* browser =

[lazyboy, 2016/08/11 18:52:40]

I think you need to change this?

Also |source_web_contents_| below crashes for me locally when I tried.

[takumif, 2016/08/15 16:40:10]

Done.

       chrome::FindBrowserWithWebContents(source_web_contents_);
   DCHECK(browser);
 
   media_router::MediaRouterDialogController* dialog_controller =
       media_router::MediaRouterDialogController::GetOrCreateForWebContents(
           source_web_contents_);
   if (!dialog_controller)
     return;
 
   dialog_controller->ShowMediaRouterDialog();
@@ skipping 62 matching lines @@
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }
 
 Browser* RenderViewContextMenu::GetBrowser() const {
   return chrome::FindBrowserWithWebContents(embedder_web_contents_);
 }