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ResourceFetcher/ResourceLoader now saves the result of the CORS check on
the Resource object. Though the result of the CORS check varies
depending on the source origin, reusing an existing resource fetched by
a different source origin is allowed by mistake.

This patch introduces a logic to prevent MemoryCache entries from being
reused for requests with a different source (requestor) origin by saving
the source origin on the Resource object and comparing that with the new
source origin in Resource::CanReuse(), so that the result of the CORS
check is reused only when the source origin is the same.

An alternative possibly-better approach is to isolate MemoryCache for
different origins by changing the cache identifier to take into account
the source origin of requests. However, to keep the patch small and fix
the issue quickly, this patch just prevents reuse.

Bug: 799477, 809350
Change-Id: Ib96c9e728abe969a53f3d80519118a83392067b4
Reviewed-on: https://chromium-review.googlesource.com/897040
Commit-Queue: Takeshi Yoshino <tyoshino@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537580}