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This CL migrates AwViewMsg_SetInitialPageScale to
LocalMainFrame interface.

Bug: 1157124
Change-Id: I2750606e2dfa56d2b0fa2e710510d23333f17304
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583668
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@{#836409}