Null check content view core before using it.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index af88a1b5ec0568e78b2632ca7d2f6db0b6eb94e4..665ae2a307577315ee35ef9b4a34806db7e9ed9e 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -1111,6 +1111,9 @@ void RenderWidgetHostViewAndroid::RetainFrame(
 
 void RenderWidgetHostViewAndroid::SynchronousFrameMetadata(
     const cc::CompositorFrameMetadata& frame_metadata) {
+  if (!content_view_core_)
+    return;
+
   // This is a subset of OnSwapCompositorFrame() used in the synchronous
   // compositor flow.
   OnFrameMetadataUpdated(frame_metadata);