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This will also allow converting the remaining providers in //clank.
Moving providers to the base module gives more time for the chrome split
preload to work, see http://crrev.com/c/2577546 for more info.

Note I removed the onCreate method from ChromeBrowserProvider, because
it just calls ensureNativeSideInitialized(). Every method which uses
native already calls canHandleContentProviderApiCall() which internally
will call ensureNativeSideInitialized(), so it seems unnecessary to call
from onCreate. This simplifies things a bit.

Review from Patchset 1 on for better diffs, Patchset 1 just moves
ChromeBrowserProvider.java to ChromeBrowserProviderImpl.java.

Bug: 1150600
Change-Id: I98134425b32173211293a4306f7e962934ed47c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591879
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837129}