Fix TextInputClientMac related crashes of Fullscreen RenderWidget

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 11172c31d3b9c4f0fc6bcffb7a69d687a4238cc9..fa092e8ad85c20dca098562a2bcc49916d48143a 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -928,10 +928,9 @@ RenderWidgetHostView* WebContentsImpl::GetTopLevelRenderWidgetHostView() {
 
 RenderWidgetHostView* WebContentsImpl::GetFullscreenRenderWidgetHostView()
     const {
-  RenderWidgetHost* const widget_host =
-      RenderWidgetHostImpl::FromID(fullscreen_widget_process_id_,
-                                   fullscreen_widget_routing_id_);
-  return widget_host ? widget_host->GetView() : NULL;
+  if (auto widget_host = GetFullscreenRenderWidgetHost())
+    return widget_host->GetView();
+  return nullptr;
 }
 
 WebContentsView* WebContentsImpl::GetView() const {
@@ -5015,6 +5014,11 @@ int WebContentsImpl::GetOuterDelegateFrameTreeNodeId() {
   return FrameTreeNode::kFrameTreeNodeInvalidId;
 }
 
+RenderWidgetHostImpl* WebContentsImpl::GetFullscreenRenderWidgetHost() const {
+  return RenderWidgetHostImpl::FromID(fullscreen_widget_process_id_,
+                                      fullscreen_widget_routing_id_);
+}
+
 RenderFrameHostManager* WebContentsImpl::GetRenderManager() const {
   return frame_tree_.root()->render_manager();
 }