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Change the app menu IPH string.

Bug: 1139076
Change-Id: If15af359610cdd1ea9138d8f95555c5c2aec0950
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615303Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841280}