Fix message routing for BrowserPlugin in iframe

extensions/browser/guest_view/web_view/web_view_apitest.cc

Index: extensions/browser/guest_view/web_view/web_view_apitest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_apitest.cc b/extensions/browser/guest_view/web_view/web_view_apitest.cc
index 0502ecb78315d883eda06110577d7ecbe5de4d80..2e63b790e4d353eca1e578cd61fc2f70d7e07793 100644
--- a/extensions/browser/guest_view/web_view/web_view_apitest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_apitest.cc
@@ -143,6 +143,7 @@ void WebViewAPITest::LaunchApp(const std::string& app_location) {
   extension_system_->LaunchApp(extension->id());
 
   ExtensionTestMessageListener launch_listener("LAUNCHED", false);
+  launch_listener.set_failure_message("FAILURE");
   ASSERT_TRUE(launch_listener.WaitUntilSatisfied());
 
   embedder_web_contents_ = GetFirstAppWindowWebContents();
@@ -705,4 +706,10 @@ IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestWebRequestAPIGoogleProperty) {
   RunTest("testWebRequestAPIGoogleProperty", "web_view/apitest");
 }
 
+// This test verifies that webview.contentWindow works inside an iframe
+IN_PROC_BROWSER_TEST_F(WebViewAPITest, TestWebViewInsideFrame) {
+  LaunchApp("web_view/inside_iframe");
+}
+
+
 }  // namespace extensions