Use v8::Context::NewRemoteContext in RemoteWindowProxy.

third_party/WebKit/Source/web/tests/WebFrameTest.cpp

Index: third_party/WebKit/Source/web/tests/WebFrameTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
index dcaacbcf8c23311905e408621585bb18e1b8140e..e6d91419d044bdca664f61b6ea96707661bc64f7 100644
--- a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
@@ -8950,6 +8950,24 @@ TEST_F(WebFrameSwapTest, RemoteWindowNamedAccess) {
   reset();
 }
 
+TEST_F(WebFrameSwapTest, RemoteWindowToString) {
+  v8::HandleScope scope(v8::Isolate::GetCurrent());
+
+  FrameTestHelpers::TestWebRemoteFrameClient remoteClient;
+  WebRemoteFrame* remoteFrame = remoteClient.frame();
+  lastChild(mainFrame())->swap(remoteFrame);
+  remoteFrame->setReplicatedOrigin(SecurityOrigin::createUnique());
+  v8::Local<v8::Value> exception = mainFrame()->executeScriptAndReturnValue(
+      WebScriptSource("try { '' + window[2]; } catch (e) { e; }"));

[jochen (gone - plz use gerrit), 2017/03/23 18:27:48]

Object.prototype.toString.call(window[2]) should work, no?

[dcheng, 2017/03/23 18:31:51]

Hmm... that's one version I forgot to try. I'll upload a followup CL if this
makes a difference.

+  ASSERT_FALSE(exception.IsEmpty());
+  EXPECT_STREQ(
+      "SecurityError: Blocked a frame with origin \"http://internal.test\" "
+      "from accessing a cross-origin frame.",
+      *v8::String::Utf8Value(exception));
+
+  reset();
+}
+
 // TODO(alexmos, dcheng): This test and some other OOPIF tests use
 // very little of the test fixture support in WebFrameSwapTest.  We should
 // clean these tests up.