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RenderWidgetHostImpl already checks for |delegate_| before calling the
method. The other caller does so in the same stack that it uses the
WebContents, which is the delegate. The delegate is removed only when
the WebContents is destroyed, so we know it will be present in both
cases.

TBR=ajwong@chromium.org

Change-Id: Ia0fe71c00a87bb92b22ebeff545762fbcf72848d
Bug: 912193
Reviewed-on: https://chromium-review.googlesource.com/c/1443933
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628349}