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Previously RendererStartupHelper::GetRenderer() returns
mojom::Renderer* having DCHECK that makes sure the map includes
it. But, GetRenderer() would be accessed before the map is updated.

This CL returns nullptr from RendererStartupHelper::GetRenderer()
when |process_mojo_map_| doesn't have the information corresponding
to the process.

Bug: 1157200
Change-Id: Ifacc4cfcd9457716d7eca700b7df4be8576f68b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583663
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836393}