Temporarily mark testBackCollapsesSearchView as LargeTest

testBackCollapsesSearchView started flaking today in presubmit.
This change removes this test from blocking presubmit as it is not
SmallTest or MediumTest anymore.

Bug: 34956766
Change-Id: I65f53767e356e0302adb8036922a8170dace59a9
(cherry picked from commit 0fa84e46e9b72d8d20dfafaed1f4c72b0d6351fd)
1 file changed