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When drmemory_full runs, the browser tests are slowed down enough to
timeout the user gesture indicator, which prevents autofill from
processing the input and passing the browser test. The fix is to disable
user gesture checking for all autofill browser tests except
AutofillRendererTest.IgnoreNonUserGestureTextFieldChanges.

TBR=thestig@chromium.org,estade@chromium.org
BUG=484910

Review URL: https://codereview.chromium.org/1143593003

Cr-Commit-Position: refs/heads/master@{#330300}