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Now that hit-testing for views (crbug.com/388838) and
event-targeting for views (crbug.com/391845) use
ViewTargeterDelegate to define custom behaviour for
these operations (instead of the now-obsolete
approach of subclassing ViewTargeter itself), we
should not be calling into EventTargeter for this
purpose. Changes in this CL:

* Finding the target of a scroll event is now
  performed correctly by using the logic in
  ViewTargeterDelegate and its overrides.

* The dead code
  ViewTargeter::SubtreeCanAcceptEvent(),
  ViewTargeter::EventLocationInsideBounds(),
  and ViewTargeter::BoundsForEvent() have been
  removed along with their corresponding tests.

* The class-level documentation for ViewTargeter
  and ViewTargeterDelegate has been updated
  to clarify the purpose of these classes.

BUG=395387,370579
TEST=ViewTargeterTest.*

Review URL: https://codereview.chromium.org/426443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287620 0039d316-1c4b-4281-b951-d872f2087c98