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This reverts commit 2b9c5c7c.

Reason for revert: This CL is likely the root cause for build failure for linux-chromeos-dbg, starting from https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/21474
The failed tests are: InputMethodManagerImplTest.SetLoginDefaultWithAllowedKeyboardLayouts
InputMethodManagerImplTest.TestEnableLayoutsNonUsHardwareKeyboard
InputMethodManagerImplTest.TestEnableMultipleHardwareKeyboardLayout

Original change's description:
> Always inject mocks for more hemertic InputMethodManagerImpl unit tests.
>
> Six InputMethodManagerImpl tests are failing in specific environments
> due to mixed usage of test data and CrOS prod configs. Partly caused by
> inconsistent usage of MockComponentExtensionIMEDelegateManager. In
> particular, parts of Setup() are run without this mock injected. The fix
> here ensures the mock and its test data are consistently used throughout.
>
> With this we manage to un-fail 4 out of 6 tests, but another new test
> starts failing! It's unsurprising because these tests still indirectly
> depend on deprecated input_methods.txt configs (remnant from before the
> migration to extension-based input methods circa 2011). This issue will
> be addressed in the next steps.
>
> Bug: 970790
> Change-Id: I3e76708e34f2b4e021f763654714d157f48a3925
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550152
> Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
> Reviewed-by: John Palmer <jopalmer@chromium.org>
> Reviewed-by: Darren Shen <shend@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#831198}

TBR=ynovikov@chromium.org,shend@chromium.org,tranbaoduy@chromium.org,jopalmer@chromium.org

Change-Id: I4fea5ebf6f46f66ba837d693f7970a0ac8949054
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 970790
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560527Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831256}