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The extensions::Dispatcher::is_extension_process flag is set for both the
standalone extensions renderer and single process mode. This caused
ChromeContentRendererClient to act differently in single process mode, like
returning true from ShouldFork for any navigation started by blink, which
would cause a new WebView to be created for each navigation.

BUG=462210

Review URL: https://codereview.chromium.org/956313002

Cr-Commit-Position: refs/heads/master@{#318938}