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This CL changes the names of the touch tracking recognizers delegates
name. The gesture recognizer has two delegates:
 1. The UIGestureRecognizerDelegate (self.delegate)
 2. The CRWTouchTrackingDelegate (self.touchTrackingDelegate)
Prior to this CL, 1. was called using self.delegate and 2. was called
using _delegate. This was very confusing as the reader could expect
_delegate to be the ivar associated with self.delegate, not with
self.touchTrackingDelegate.

This CL cleans this by changing _delegate into _touchTrackingDelegate.

Bug: none
Change-Id: I24331d455f8cea61c117ea698e06f26fbc13ca6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732083
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683622}