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The HidCollectionInfo and HidUsageAndPage were defined in mojom,
so the duplicated definitions in C++ should be removed.

The hid.typemap and struct traits are also removed.

BUG=728223

Change-Id: Id53d19ebb930b9b60910c8b23a145dbf058a7f8a
Reviewed-on: https://chromium-review.googlesource.com/708775
Commit-Queue: Ke He <ke.he@intel.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509324}