Update style guide to reflect the new Google C++ coding guidelines.

Initiated after discussion on cxx and with danakj@

Specifically: https://google.github.io/styleguide/cppguide.html#Casting

"Use brace initialization to convert arithmetic types (e.g. int64{x}).
 This is the safest approach because code will not compile if conversion
 can result in information loss. The syntax is also concise."

(This exact guidance is mirrored in our internal style guide as well.)

Change-Id: I04f825cc84aa6e34517cb533d25053bec345297e
Reviewed-on: https://chromium-review.googlesource.com/1223332
Reviewed-by: danakj <[email protected]>
Commit-Queue: Dana Fried <[email protected]>
Cr-Commit-Position: refs/heads/master@{#591102}
1 file changed