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This CL:
1. Fixes |AudioOutputAuthorizationHandlerTest| by using
   |net::TestURLRequestContextGetter| (The original code has an
   use-after-release issue, see bug for logs).
2. Fixes |RenderProcessHostUnitTest| by returning a valid pointer in
   |TestBrowserContext::CreateRequestContextForStoragePartition()|.

This patch doesn't have behavior change.

Bug: 826869
Change-Id: I05982ce49a9d42029cc3278fa248587820790d74
Reviewed-on: https://chromium-review.googlesource.com/1026986
Commit-Queue: Chong Zhang <chongz@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556127}