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Re-enable the tests listed below. These tests require legacy event
dispatch so that fake keyboard events the test sends are processed by
the Blink default event handler. If we do not do this, the fake Tab
keyboard events are not processed and thus can't move the focus.

TabindexOpenDialog/FileManagerBrowserTest.Test*
TabindexSaveFileDialog/FileManagerBrowserTest.Test*

These tests aren't supported by Mash: disable on Mash.

Bug: 836254,480491,482121
Change-Id: I91ecbfbf2944a702f473ffcb097942a61c260726
Reviewed-on: https://chromium-review.googlesource.com/1034425
Commit-Queue: Luciano Pacheco (SYD) <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554706}