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This reverts commit 7e18556b.

Reason for revert: Breaks devtools overlay: crbug.com/1090280
and link hovering: https://bugs.chromium.org/p/chromium/issues/detail?id=841792#c24

Original change's description:
> Mac: don't use a custom tracking area in BridgedContentView
> 
> Currently, in BridgedContentView we "opt out"[1] of BaseView's tracking area to install a different one which:
> - Specifies `NSTrackingCursorUpdate`
> - As a consequence, only tracks while app is active, since the docs say that always tracking is incompatible with cursor updates
> 
> However:
> - Empirically, cursor updates work fine without this (some test cases: move mouse between Omnibox and other parts of topchrome, move from webcontent links/inputs to topchrome and vice-versa).
> - Only tracking while app is active means we don't get entered/exited events from app switching. This means:
>   - Switching away from Chrome while showing a topchrome hover tooltip keeps the hover on and makes the tooltip stuck
>   - Under some circumstances, hover stops working on switching back to Chrome (see bug)
>   - Even though we allow mouse clicks to function when Chrome is inactive (that is, we return `YES` from `acceptsFirstMouse:`, we don't process hovers in this case, contrary to other apps on the system.
> 
> This change removes BridgedContentView's tracking area in favor of the default one and gives BaseView some explicit enable/disables, mostly to make tests happy.
> 
> [1] By overriding a private method with a no-op!
> 
> Bug: 841792
> 
> Change-Id: Ifb5d65e22299959b8cac25a9e0a0407650a40746
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216530
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Leonard Grey <lgrey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#773848}

TBR=ellyjones@chromium.org,avi@chromium.org,lgrey@chromium.org

Change-Id: Ic1344adb7cdf271636026a2b1e6def014852416f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 841792, 1090280
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223949Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774088}