Don't remove -mfpmath=sse when building with clang.

Don't remove -mfpmath=sse when building with clang.

Clang uses SSE for fpmath by default, so this change shouldn't have an effect
in practice, it just makes this code a bit shorter.

(This was added almost 4 years ago: http://crrev.com/59882 Clang seems to have
learned about the flag since then.)

BUG=none

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287023

[hans, 2014-08-01 01:38:54]

lgtm

[Nico, 2014-08-01 01:46:22]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2014-08-01 01:48:09]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thakis@chromium.org/419803008/1

[commit-bot: I haz the power, 2014-08-01 09:33:25]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_x64_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[commit-bot: I haz the power, 2014-08-01 17:01:31]

Change committed as 287023