Make GN build match gyp (/bigobj everywhere) and remove now-unnecessary settings

Make GN build match gyp (/bigobj everywhere) and remove now-unnecessary settings

Previously added to gyp by https://codereview.chromium.org/1188603004.

R=brettw@chromium.org,jam@chromium.org
BUG=173851
Committed: https://crrev.com/c4d566d2e08b7ec74bba484676a9b408d3866c42
Cr-Commit-Position: refs/heads/master@{#334734}

[scottmg, 2015-06-16 18:35:15]

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

[scottmg, 2015-06-16 18:35:43]

brettw for compiler build.gn
jam for content owners

[scottmg, 2015-06-16 19:05:17]

The CQ bit was checked by scottmg@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-06-16 19:06:27]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1190813002/1

[commit-bot: I haz the power, 2015-06-16 20:14:20]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-16 20:14:21]

Dry run: This issue passed the CQ dry run.

[brucedawson, 2015-06-16 20:20:19]

brucedawson@chromium.org changed reviewers:
+ brucedawson@chromium.org

[brucedawson, 2015-06-16 20:20:19]

lgtm

[jam, 2015-06-16 22:54:37]

lgtm

[scottmg, 2015-06-16 22:58:30]

The CQ bit was checked by scottmg@chromium.org

[commit-bot: I haz the power, 2015-06-16 22:59:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1190813002/1

[commit-bot: I haz the power, 2015-06-16 23:06:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-16 23:07:42]

Patchset 1 (id:??) landed as
https://crrev.com/c4d566d2e08b7ec74bba484676a9b408d3866c42
Cr-Commit-Position: refs/heads/master@{#334734}

[Marijn Kruisselbrink, 2015-06-16 23:41:01]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1177073007/ by mek@chromium.org.

The reason for reverting is:
C:\b\build\slave\Win_x64_Builder__dbg_\build\src\content\common\content_message_generator.cc
: fatalerror C1128: number of sections exceeded object file format limit :
compile with /bigobj

http://build.chromium.org/p/chromium.win/builders/Win%20x64%20Builder%20%28db....