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This is a reland of 3d28a29b.

In the original change, NotificationPlatformBridgeWinTest.Suppress and
NotificationPlatformBridgeWinUITest.GetDisplayed failed in win-asan bot.

This CL fixed it.

The fix also required MockIToastNotification to derive from RuntimeClass,
which significantly simplified its implementation.

Original change's description:
> 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}

Bug: 884224, 886957
Change-Id: If2674299437f04f637f6b2b8278b40a4dbf7b9d0
Reviewed-on: https://chromium-review.googlesource.com/1228991
Commit-Queue: Xi Cheng <chengx@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592487}