Mac: Update tracking area workaround.
http://crrev.com/
941543002 did not succeed in fixing the crashes from
http://crbug.com/315379, and caused a regression http://crbug.com/470035.
This patch is a partial revert to reset the tracking area every time the
view is resized, but only applies the workaround on 10.7 to 10.9,
since the AppKit bug was introduced on 10.7 and is fixed on 10.10.
BUG=470035,315379
Review URL: https://codereview.chromium.org/
1046823003
Cr-Commit-Position: refs/heads/master@{#322837}