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The SpellCheckHost mojom has some platform-dependent APIs.

This patch uses the EnableIf mojo attribute so that we don't need
to leave dummy API implementations on unsupported platforms.

Bug: 813217
Change-Id: I407ebc6687c404b1583ceeac346a29cb775847ee
Reviewed-on: https://chromium-review.googlesource.com/905579
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537879}