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This flag was added as a means of swapping the ABIs of a 64-bit build,
to get a 64-bit browser instead of 32.  There are now build targets to
achieve the same thing, so the flag can be removed.

On a 64-bit configuration, you can now build:

- monochrome_public_bundle: 32-bit browser w/ 64-bit WebView
- monochrome_64_32_public_bundle: 64-bit browser w/ 32-bit WebView
- monochrome_64_public_bundle: 64-bit browser

BUG=907640

Change-Id: Id021645ac9b411510fdf23c09428d3d888a857f5
Reviewed-on: https://chromium-review.googlesource.com/c/1458360Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630000}