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This CL migrates AwViewMsg_SetTextZoomFactor to
LocalMainFrame interface.

Bug: 1157121
Change-Id: Ieece64440d74fe38b6e7ee6073f98f495aebe058
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583667
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836373}