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This CL reduces the width of the area used for triggering
gesture navigation. The reported conflicts with other UI
can be alleviated.

Bug: 1128629
Change-Id: I726453adc3dfd1848332ee668d11662c44afdb55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2448070
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814586}