A speculative fix for a MediaValues related crash

Source/core/css/MediaValuesCached.cpp

Index: Source/core/css/MediaValuesCached.cpp
diff --git a/Source/core/css/MediaValuesCached.cpp b/Source/core/css/MediaValuesCached.cpp
index 60caa50af3008dcbc1deaafa788260fc6fd613c3..01e674230f2ae035c323c2fff9a9ff0f40efdfb1 100644
--- a/Source/core/css/MediaValuesCached.cpp
+++ b/Source/core/css/MediaValuesCached.cpp
@@ -34,7 +34,8 @@ PassRefPtr<MediaValues> MediaValuesCached::create(LocalFrame* frame)
 {
     // FIXME - Added an assert here so we can better understand when a frame is present without its view().
     ASSERT(!frame || frame->view());
-    if (!frame || !frame->view())
+    // FIXME - Because of crbug.com/371084, document()->renderView() may be null here.
+    if (!frame || !frame->view() || !frame->document() || !frame->document()->renderView())
         return adoptRef(new MediaValuesCached());
     return adoptRef(new MediaValuesCached(frame));
 }