Revert "[MacViews] Hook Web Content Textfield Touch Bar Support"

This reverts commit f9da90b4c8ed7a7cc823c9bc3012658ca187b393.

Reason for revert: Broke Mac10.11 Tests: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac10.11%20Tests/28261

Test failures:

BrowserWindowTouchBarControllerTest.SearchEngineChanges
BrowserWindowTouchBarControllerTest.DestroyNotificationBridge
BrowserWindowTouchBarControllerTest.TabChanges



Original change's description:
> [MacViews] Hook Web Content Textfield Touch Bar Support
> 
> Remove Cocoa dependency from WebTextfieldTouchBar by moving
> it from TabContentsController to BrowserWindowTouchBarController.
> 
> Hook up BrowserWindowTouchBarController to
> AutofillPopupControllerImplMac on MacViews so that the
> credit card touch bar can be updated.
> 
> Move the the logic that listens to WebContent changes to the
> BrowserWindowTouchBarController. When the WebContents has
> changed, BrowserWindowTouchBarController will update the
> WebContents in BrowserWindowDefaultTouchBar and
> WebTextfieldTouchBarController.
> 
> Modified SuggestedTextTouchBarController so that when its
> WebContents has changed, it'll observe the new WebContents.
> 
> Bug: 856391
> Change-Id: I9c29a371a0b38eb608bf8e32521abe22d5c664e0
> Reviewed-on: https://chromium-review.googlesource.com/1135829
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Sarah Chan <spqchan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#577940}

TBR=avi@chromium.org,spqchan@chromium.org

Change-Id: Ifffb93394919b40f05942eebbc3e87c07c69d7d5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 856391
Reviewed-on: https://chromium-review.googlesource.com/1150248
Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Derek Cheng <imcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578015}
14 files changed