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IMEBridge is only ever initialized for Chrome OS [1], so all usages of
IMEBridge::Get() will return nullptr for other platforms.

Mark those functions as Chrome OS only, and (re)move any usages that
appear in other platforms.

A followup patch will move IMEBridge to ui/base/ime/chromeos.

[1] https://source.chromium.org/search?q=IMEBridge::Initialize&sq=&ss=chromium%2Fchromium%2Fsrc&originalUrl=https:%2F%2Fcs.chromium.org%2F

Bug: 1083803
Change-Id: Ic9cb463a918ef990dfff5ef29e311b3fbfb664b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212198Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772136}