Fix crash with renderer receiving kMouseEnter and a mouse locked target.

Convert kMouseEnter to mouseover event.

BUG=798810

Change-Id: Ie62a45df72536d611f9a38c5bef2d6f9a84a449a
Reviewed-on: https://chromium-review.googlesource.com/847939
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527027}

third_party/WebKit/Source/core/exported/WebViewImpl.cpp

@@ -2041,6 +2041,9 @@ WebInputEventResult WebViewImpl::HandleInputEvent(
 
     AtomicString event_type;
     switch (input_event.GetType()) {
+      case WebInputEvent::kMouseEnter:
+        event_type = EventTypeNames::mouseover;
+        break;
       case WebInputEvent::kMouseMove:
         event_type = EventTypeNames::mousemove;
         break;

third_party/WebKit/Source/core/frame/WebFrameWidgetImpl.cpp

@@ -422,6 +422,9 @@ WebInputEventResult WebFrameWidgetImpl::HandleInputEvent(
 
     AtomicString event_type;
     switch (input_event.GetType()) {
+      case WebInputEvent::kMouseEnter:
+        event_type = EventTypeNames::mouseover;
+        break;
       case WebInputEvent::kMouseMove:
         event_type = EventTypeNames::mousemove;
         break;