DevTools: migrate DevTools APIs to use WebContents instead of RenderViewHost.

chrome/browser/ui/webui/extensions/extension_settings_handler.cc

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.cc
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
index 3ac289db6b8d8d0e31627595373b881d66920bf6..fa0360546a375a262f14d546338d54667c5dc7ff 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.cc
@@ -935,12 +935,12 @@ void ExtensionSettingsHandler::HandleInspectMessage(
 
   RenderViewHost* host = RenderViewHost::FromID(render_process_id,
                                                 render_view_id);
-  if (!host) {
+  if (!host || !WebContents::FromRenderViewHost(host)) {
     // This can happen if the host has gone away since the page was displayed.
     return;
   }
 
-  DevToolsWindow::OpenDevToolsWindow(host);
+  DevToolsWindow::OpenDevToolsWindow(WebContents::FromRenderViewHost(host));
 }
 
 void ExtensionSettingsHandler::HandleLaunchMessage(