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I ran check_gn_headers.py on linux and android full builds, merged the
missing header file lists, fed to fix_gn_headers.py (without
AddHeadersToSources), chose which matches to apply interactively, and
manually fixed the results.

Read more about the manual fixes in the Review-Url.

The number of missing header files on linux and android decreased by 9,
from 840 to 831.

None of the fixed files are included in the following spreadsheet:
https://docs.google.com/spreadsheets/d/15az3FMl-jAS0mx4E9XVSBVHVpmEzo-9EAGY0ywe7bZs/edit#gid=0

fix_gn_headers.py is from https://codereview.chromium.org/2790563003

BUG=661774

Review-Url: https://codereview.chromium.org/2846463002
Cr-Commit-Position: refs/heads/master@{#468192}