gn format // (the rest, except mojo)

Excluded mojo because I think that needs to happen on the other side.

At gn --version = 306668 for which roll is in CQ.

R=brettw@chromium.org
TBR=scherkus@chromium.org
BUG=348474

Review URL: https://codereview.chromium.org/774353003

Cr-Original-Commit-Position: refs/heads/master@{#306708}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 34fb7e5919ed42dc800acf3961fe6a2bf9e7d6eb
Cleanup: Get rid of more base::ASCIIToWide usage.

Also do some lint cleanups.

BUG=23581

Review URL: https://codereview.chromium.org/777623002

Cr-Original-Commit-Position: refs/heads/master@{#306905}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 8badc79882ad8723e60cf47aeb41c56adb2789b3
Experimenting x86_64 support

WIP