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Previously, the Blink spellchecking enabled state was initialized from
ChromeContentRendererClient::RenderViewCreated(), which only did
this for RenderViews where the main frame was a local frame.

This CL moves that initialization logic into RenderFrameCreated(),
where it is applied to all main frames.  Other than being good cleanup
because RenderView is going away, this also makes it also work for
provisional main frames (i.e., when the main frame is remote and it
navigates back to a local frame).  The latter became more common
after r501081, which means that the spellcheck enabled setting wasn't
always respected after cross-process main frame navigations prior to
this fix.

Bug: 784673
Change-Id: I91851c35027715b3d0c3a6ddfc22c514806adff3
Reviewed-on: https://chromium-review.googlesource.com/794790Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519917}