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The WebViewBrowserPluginSpecificTest class includes tests which use a
BrowserPluign-based GuestView. Since all GuestViews except MimeHandlerViewGuest
are now based on cross-process frames, these tests should not be implemented as
WebViewGuest tests anymore.

This CL introduces a new chrome browser test target for such
BrowserPluginSpecific tests where the tests instantiate a MimeHandlerViewGuest
instead of a <webview>.

Ideally, the tests should have lived with the rest of MimeHandlerViewTests in
extension layer; however, due to chrome layer dependencies it is not possible.

Bug: 659750, 533069, 330264, 870604
Change-Id: Ica252a60e94bad47cabbff8b9275b8f9fb05d7ae
Reviewed-on: https://chromium-review.googlesource.com/1168734
Commit-Queue: Ehsan Karamad <ekaramad@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582345}