Early-return in RenderViewImpl::DidFlushPaint() if there is no WebView.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index a23022d868b4d50e97c987b672a53812c5d68694..a888c643ac3094b5fd695157cd253a10fc2a48b3 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -4336,6 +4336,11 @@ void RenderViewImpl::DidFlushPaint() {
   // won't change out from under us.
   pepper_delegate_.ViewFlushedPaint();
 
+  // If the RenderWidget is closing down then early-exit, otherwise we'll crash.
+  // See crbug.com/112921.
+  if (!webview())
+    return;
+
   WebFrame* main_frame = webview()->mainFrame();
 
   // If we have a provisional frame we are between the start and commit stages