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This reverts commit a99f67ed.

Reason for revert: https://crbug.com/770193 - IO assert on main thread in browser startup.

Original change's description:
> Move ComBase functions and HSTRING helpers to base/win.
> 
> Bug: 734095
> Change-Id: Ib984cd7094cf4e075863d692acb59722114e3990
> Reviewed-on: https://chromium-review.googlesource.com/649528
> Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
> Reviewed-by: Greg Thompson <grt@chromium.org>
> Reviewed-by: Peter Beverloo <peter@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Robert Liao <robliao@chromium.org>
> Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#505163}

TBR=dcheng@chromium.org,peter@chromium.org,toyoshim@chromium.org,finnur@chromium.org,robliao@chromium.org,grt@chromium.org

Change-Id: I150e7825b141b21b37e14ee7ff7089150aa50abb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 734095
Reviewed-on: https://chromium-review.googlesource.com/692615Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505368}