Add NULL renderer check when setting layer for a remote frame

Follow-up to r176130. Ojan noted that the Frame might not have an
ownerRenderer, this patch adds a check for that scenario.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/339873003

git-svn-id: svn://svn.chromium.org/blink/trunk@176341 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

@@ -565,7 +565,8 @@ void WebLocalFrameImpl::setRemoteWebLayer(WebLayer* webLayer)
     // FIXME: This should be moved to WebRemoteFrame.
     ASSERT(frame()->deprecatedLocalOwner());
     frame()->deprecatedLocalOwner()->setNeedsCompositingUpdate();
-    frame()->ownerRenderer()->layer()->updateSelfPaintingLayer();
+    if (RenderPart* renderer = frame()->ownerRenderer())
+        renderer->layer()->updateSelfPaintingLayer();
 }
 
 void WebLocalFrameImpl::setPermissionClient(WebPermissionClient* permissionClient)