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This CL adds a new item “Webpage, Single File (Web Bundle)” in the
“Save as type” select box of “Save As” dialog box for Desktop when
SavePageAsWebBundle feature flag is set using --enable-features command
line flag.

The logic of Web Bundle generation in WebBundler is not implemented yet.
WebBundler just returns WebBundlerError::kNotImplemented error.
So the request of save as WebBundle is just canceled.

Bug: 1040752
Change-Id: Iacb8a66e2fa8bc6b630d200a54bacd64a723eb0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2053745Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750479}