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This is a silly remnant of the extensions refactor. We go to chrome to go
back to extensions. This removes this API and calls IsWebViewRequest directly.

BUG=352293
TBR=sky@chromium.org for code deletion in chrome_extensions_browser_client

Review URL: https://codereview.chromium.org/590603002

Cr-Commit-Position: refs/heads/master@{#295872}