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The HeadlessContentRendererClient does not implement CreateBrowserPluginDelegate
which causes a renderer crash in the headless mode for objects which set their
type to "application/browser-plugin". This CL adds a null check to
RenderFrameImpl to stop the crash.

Bug: 958678
Change-Id: Ic90ecbded86e764fb81eb9796b5d9e2732966fb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1598323Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657570}