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[ios] Use local variables and "using" clause to improve formatting

Use local variables to store the title for action injected to the
action menu controller and use "using" clause to reduce length of
the lines in order to improve formatting of the file.

Bug: none
Change-Id: Ia9a46cc8f666757097dd1adf49e8054d3bb74578
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544724
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828332}