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This reverts commit b17c0966.

Reason for revert: CL caused build failures on chrome/ci/android-internal-chromium-tot. 

Original change's description:
> Remove PrefServiceBridge.java
> 
> Port PrefServiceBridgeTest to PrefServiceTest.
> Update docs.
> Update OWNERS.
> 
> Bug: 1071603
> Change-Id: I48f83e1faade5263a6b105268bfd57ded3db27e5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307609
> Commit-Queue: Evan Stade <estade@chromium.org>
> Reviewed-by: Dominic Battré <battre@chromium.org>
> Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#790210}

TBR=battre@chromium.org,estade@chromium.org,chouinard@chromium.org

Change-Id: Ic25ffc3e2fc0b0bab9f280906afa8e4ea0ffc387
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1071603
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308414Reviewed-by: Anna Malova <amalova@chromium.org>
Commit-Queue: Anna Malova <amalova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790327}