Fix a crash when setting MediaControlsEnabled setting for videos without controls

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index 7c10b4a0cd078280ff55051abb8acc756b5cb6e8..c4e67443b6595552a9423cf2826c9291ad69d6ab 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -381,7 +381,8 @@ void HTMLMediaElement::onMediaControlsEnabledChange(Document* document) {
   WeakMediaElementSet& elements = *it->value;
   for (const auto& element : elements) {
     element->updateControlsVisibility();
-    element->mediaControls()->onMediaControlsEnabledChange();
+    if (element->mediaControls())
+      element->mediaControls()->onMediaControlsEnabledChange();
   }
 }