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Response headers that are not valid UTF-8 can't be stored in a
base::StringValue, which is always a UTF-8 string, so escape any non-ASCII
values to be safe. This prevents a DCHECK when dev tools' network request
inspector is open and we receive these headers.

BUG=299880

Review URL: https://codereview.chromium.org/453483002

Cr-Commit-Position: refs/heads/master@{#288357}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288357 0039d316-1c4b-4281-b951-d872f2087c98