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This CL addresses issues with complex structures nested inside links
on Android. We now never consider a link as a leaf node to ensure
that the entire structure is traversable. We update the method
IsInterestingOnAndroid to make simple cases un-interesting to prevent
double navigation issues. We also change the AccessibilityNodeInfo
passed to TalkBack to prevent structure from being too verbose
when read.

Unit test expectations updated to account for change.

Bug: 1018555
Change-Id: I0b0d60f0ec69f400023c21ad92f3fbe69f08d378
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955098
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737936}