OOPIF: Don't crash when running layout tests that have an OOP iframe.

This CLs fixes a few places in layout test code that were assuming
that the top-level frame is local, which was causing renderer crashes
when running a layout test containing a cross-site frame with
--site-per-process.  For example, most tests under
http/tests/security/postMessage/ ran into this.

BUG=474792
TEST=http/tests/security/postMessage/* tests don't crash with --site-per-process

Review URL: https://codereview.chromium.org/1073533002

Cr-Commit-Position: refs/heads/master@{#324311}

content/shell/renderer/layout_test/webkit_test_runner.cc

@@ -657,14 +657,17 @@ void WebKitTestRunner::Reset() {
   current_entry_indexes_.clear();
 
   render_view()->ClearEditCommands();
-  render_view()->GetWebView()->mainFrame()->setName(WebString());
+  if (render_view()->GetWebView()->mainFrame()->isWebLocalFrame())
+    render_view()->GetWebView()->mainFrame()->setName(WebString());
   render_view()->GetWebView()->mainFrame()->clearOpener();
 
   // Resetting the internals object also overrides the WebPreferences, so we
   // have to sync them to WebKit again.
-  WebTestingSupport::resetInternalsObject(
-      render_view()->GetWebView()->mainFrame()->toWebLocalFrame());
-  render_view()->SetWebkitPreferences(render_view()->GetWebkitPreferences());
+  if (render_view()->GetWebView()->mainFrame()->isWebLocalFrame()) {
+    WebTestingSupport::resetInternalsObject(
+        render_view()->GetWebView()->mainFrame()->toWebLocalFrame());
+    render_view()->SetWebkitPreferences(render_view()->GetWebkitPreferences());
+  }
 }
 
 // Private methods  -----------------------------------------------------------

content/shell/renderer/test_runner/accessibility_controller.cc

@@ -168,7 +168,7 @@ void AccessibilityController::NotificationReceived(
   v8::HandleScope handle_scope(isolate);
 
   blink::WebFrame* frame = web_view_->mainFrame();
-  if (!frame)
+  if (!frame || frame->isWebRemoteFrame())
     return;
 
   v8::Handle<v8::Context> context = frame->mainWorldScriptContext();