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The previous tweak did not disable all possible webview browsers like,
e.g., android-webview-google.

Bug: 879151
Change-Id: Ic2b0e22b06893d7e7e769dd50fb86f46bbc9c936
Reviewed-on: https://chromium-review.googlesource.com/1219614
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#590355}