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Re-enable remaining GalleryBrowserTests and all bots

Flakiness cause in the FileManagerBrowserTests was resolved on issues:
issue 831074 issue 804413 issue 829310.

Allow these tests to run in DEBUG/MSAN/ASAN after the previous patches
on the bug selectively enabled subsets of the GalleryBrowserTest tests
on those bots and are working well [1].

[1] https://bit.ly/2HKT7kc

Bug: 835794
Change-Id: I4cf7c412c51cf051283a8f8fea9a5d1118af8f51
Reviewed-on: https://chromium-review.googlesource.com/1025854Reviewed-by: Tatsuhisa Yamaguchi <yamaguchi@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553956}