Revert of Re-add -Wno-missing-braces on win clang.

Revert of Re-add -Wno-missing-braces on win clang. (patchset #1 id:1 of https://codereview.chromium.org/1222203012/)

Reason for revert:
ANGLE has rolled in https://crrev.com/01b5c82d06fcbddd7556ea848ba803b72c61811c

Original issue's description:
> Re-add -Wno-missing-braces on win clang.
>
> ANGLE needs a roll to fix one last instance of this warning, but the
> roll is currently blocked. Disable this warning again until ANGLE can be
> successfully rolled to fda3ec747c3dca037b961c7f8c04a81766f37007.
>
> BUG=505297
> R=thakis@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/c38a1f71038e5f0a5565b42e30b8985870b49286

TBR=thakis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=505297
Committed: https://crrev.com/67c725e3ec44956a961ab8795efb3fcb369f4fe7
Cr-Commit-Position: refs/heads/master@{#338234}

[dcheng, 2015-07-09 20:43:45]

Created Revert of Re-add -Wno-missing-braces on win clang.

[Nico, 2015-07-09 20:44:09]

lgtm

[commit-bot: I haz the power, 2015-07-09 20:45:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1226143007/1

[commit-bot: I haz the power, 2015-07-09 20:46:44]

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

[commit-bot: I haz the power, 2015-07-09 20:46:46]

Failed to apply patch for build/common.gypi:
While running git apply --index -3 -p1;
  error: patch failed: build/common.gypi:5717
  Falling back to three-way merge...
  Applied patch to 'build/common.gypi' with conflicts.
  U build/common.gypi

Patch:       build/common.gypi
Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index
70d2ec571f5181e5207aa9f2df232e9a5445eab8..54732f4211238a6787c20e331b6613e01c036831
100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -5717,7 +5717,6 @@
                   '-Wno-extra-tokens',  # http://crbug.com/504663
                   '-Wno-incompatible-pointer-types',  # http://crbug.com/504696
                   '-Wno-microsoft',  # http://crbug.com/505296
-                  '-Wno-missing-braces',  # http://crbug.com/505297
                   '-Wno-msvc-include',  # http://crbug.com/505299
                   '-Wno-pointer-sign',  # http://crbug.com/505303
                   '-Wno-reorder',  # http://crbug.com/505304

[Nico, 2015-07-10 02:56:39]

rebase rebase rebase

[dcheng, 2015-07-10 03:06:57]

The CQ bit was checked by dcheng@chromium.org

[dcheng, 2015-07-10 03:06:58]

The patchset sent to the CQ was uploaded after l-g-t-m from thakis@chromium.org
Link to the patchset: https://codereview.chromium.org/1226143007/#ps70001
(title: "rebase")

[commit-bot: I haz the power, 2015-07-10 03:07:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1226143007/70001

[commit-bot: I haz the power, 2015-07-10 03:08:04]

Committed patchset #2 (id:70001)

[commit-bot: I haz the power, 2015-07-10 03:09:56]

Patchset 2 (id:??) landed as
https://crrev.com/67c725e3ec44956a961ab8795efb3fcb369f4fe7
Cr-Commit-Position: refs/heads/master@{#338234}