Fix a few memory leaks in NotificationPlatformBridgeWin

We should 1) wrap the bare pointers in ComPtr; and 2) attach
QueryInterfaces to ComPtr directly.

Bug: 884224
Change-Id: I91cb5c7312d8e24f59962ffb33faadaba36bd7ef
Reviewed-on: https://chromium-review.googlesource.com/1227493
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591737}
4 files changed