Work on Mac GN build

Work on Mac GN build.

This fixes a lot of minor mistakes (mostly missing/extra files and flags) for the Mac GN build.

I separated out some clang flags into a config for extra clang warnings. Several of the third party libraries needed to remove this.

Removes the use_nss flag and uses !use_openssl. This is a result of discussion with rsleevi.

Removes extra duplicate net build file from secondary tree.

ui/gesture_events seems to be getting compiled in GN with more strict warnings than in GYP. Rather than fix this, I fixed the warning in the gesture recognizer unit test. It was returning a const copy (the const is pointless when you're copying).

This also removes a bunch of old GYP integration stuff that was left in the GN build.

R=scottmg@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=264626

[brettw, 2014-04-17 05:20:25]

Most of the mac build works but nspr doesn't link yet because GN ignores the .s
files. I need to write support for assembler files which I think will require a
binary push.

[scottmg, 2014-04-17 18:20:45]

lgtm

https://codereview.chromium.org/239543013/diff/60001/ui/events/gesture_detect...
File ui/events/gesture_detection/gesture_provider_unittest.cc (right):

https://codereview.chromium.org/239543013/diff/60001/ui/events/gesture_detect...
ui/events/gesture_detection/gesture_provider_unittest.cc:113: EventType
GetMostRecentGestureEventType() const {
would be good to understand what the actual difference is here and add it to the
cl description

[brettw, 2014-04-17 20:36:47]

Committed patchset #5 manually as r264626.

[Nico, 2014-07-10 20:39:31]

https://codereview.chromium.org/239543013/diff/80001/skia/BUILD.gn
File skia/BUILD.gn (right):

https://codereview.chromium.org/239543013/diff/80001/skia/BUILD.gn#newcode316
skia/BUILD.gn:316: #  SkASSERT(!"sk_out_of_memory");
They had fixed all these a while ago when I asked them to. They try to build
with "regular" warnings as far as I know. If that doesn't work in gn for some
reason, consider pinging mtklein or bungeman about it and they'll likely fix it
quickly.