ISTM we should:
(1) Rewrite the Blink C++ style guide [1] to be just deltas from the Chromium[2] (and transitively, Google[3]) C++ style guide.
(2) Strive, over time, to reduce the number of deltas.
I assume #1 is non-controversial? We can likely do without the Objective-C rules now. A quick glance suggests about half the rules are obsolete or redundant with Chromium (...) style. What I don't know is if these rules match style checking tools that don't themselves "fall back" to the Chromium (...) style.
#2 is, of course, more opinionated, and is intended to codify that when an option presents itself we lean towards reducing the number of special cases (e.g. FIXME->TODO, { } -> {}, etc), not that we clang-rewrite accidentally the whole thing.