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There are 5 different kFilteredMessages arrays in content/browser
and some of them collide in jumbo (chromium unity builds)
build experiments.

This patch renames them to:
kCacheFilteredMessageClasses
kFileApiFilteredMessageClasses
kPepperFilteredMessageClasses
kRenderFilteredMessageClasses
kServiceWorkerFilteredMessageClasses

Bug: 746953
Change-Id: I3fc1b6f6ea3d0e5ccbb2ff47d4d476e02f5c2344
Reviewed-on: https://chromium-review.googlesource.com/721279Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Michael Nordman <michaeln@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#509321}