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There are still tests that wraps NavigationBarDoneButton with a local
helper function, which is unnecessary, instead, we should call EarlGrey
explicitly like following:

[[EarlGrey selectElementWithMatcher:NavigationBarDoneButton()]
      performAction:grey_tap()];

So, this CL cleans them up.

Bug: 741898
Change-Id: I74ea738cb1e58b1ee44da57c1dfaf74b7c348405
Reviewed-on: https://chromium-review.googlesource.com/568271Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mihai Sardarescu (OOO) <msarda@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Mike Baxley <baxley@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488490}