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The InputDeviceClient needs to only be created once, so remove it
from AuraTestSuiteSetup. Otherwise, in BrowserWithTestWindowTest,
it gets created twice: during test suite setup, and as part of
OzonePlatform (due to AshTestHelper/ash::Shell).

Many tests still need one though, especially those that create a
WebContents, so add it to RenderViewHostTestEnabler, which should
take care of all RenderViewHostTestHarness tests or tests that create
the enabler manually.

Also update a few other tests to either create their own
RenderViewHostTestEnabler or InputDeviceClient as appropriate.

Also the InputDeviceManager can be a true singleton now (not thread-
singleton).

Bug: 905430
Change-Id: I2974968efe0415f0b56218e24b4fa546a1524fe1
Reviewed-on: https://chromium-review.googlesource.com/c/1341075Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611556}