Improve mini installer and official build GN flags

Improve mini installer and official build GN flags

I went through and did some flag auditing to try to get GN's official build mini_installer target as small as GYP's. It's still 512 bytes too large.

Adds the custom mini_installer flags to the "lib" target as well as the main mini_installer target. This removes some imports around exception handling.

Sync some official build flags: LTCG should go on all optimized targets in official builds, not just "optimize max" ones. Doing this on optimize max has no effect because we only set optimize_max on individual libraries that need to be fast, rather than anything that gets linked.

Convert /OPT:REF to /OPT:ICF. GYP specifies both, but ICF seems to imply REF according to MSDN.

Added some missing release mode flags "/d2Zi+", "/Zc:inline", and "/cgthreads:8", which I found missing from GN.

Removed a dependency on "setup" from mini installer, this is captured by the dependency on ":archive" (which already includes the setup dependency).

Committed: https://crrev.com/7cb45ce734f09f358e62fd982c8fa288673b2ab5
Cr-Commit-Position: refs/heads/master@{#347447}

[brettw, 2015-09-03 20:02:13]

brettw@chromium.org changed reviewers:
+ scottmg@chromium.org

[scottmg, 2015-09-03 21:22:25]

lgtm

https://codereview.chromium.org/1329833002/diff/20001/chrome/installer/mini_i...
File chrome/installer/mini_installer/BUILD.gn (right):

https://codereview.chromium.org/1329833002/diff/20001/chrome/installer/mini_i...
chrome/installer/mini_installer/BUILD.gn:16: "/FS",  # Preserve previous PDB
behavior.
This is duplicated from build/config/compiler so that it's /GS- rather than /GS?
Is that really necessary?

[brettw, 2015-09-04 16:53:15]

https://codereview.chromium.org/1329833002/diff/20001/chrome/installer/mini_i...
File chrome/installer/mini_installer/BUILD.gn (right):

https://codereview.chromium.org/1329833002/diff/20001/chrome/installer/mini_i...
chrome/installer/mini_installer/BUILD.gn:16: "/FS",  # Preserve previous PDB
behavior.
I have no idea. I just copy the code from the GYP.

[brettw, 2015-09-04 16:53:19]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-09-04 16:53:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1329833002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1329833002/20001

[commit-bot: I haz the power, 2015-09-04 18:02:47]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-04 18:03:23]

Patchset 2 (id:??) landed as
https://crrev.com/7cb45ce734f09f358e62fd982c8fa288673b2ab5
Cr-Commit-Position: refs/heads/master@{#347447}