Remove redundant test: COMPILER(GCC) || COMPILER(CLANG) => COMPILER(GCC)

Remove redundant test: COMPILER(GCC) || COMPILER(CLANG) => COMPILER(GCC)

COMPILER(CLANG) =implies=> COMPILER(GCC)
so
COMPILER(GCC) || COMPILER(CLANG) == COMPILER(GCC)

Remove redundant and misleading test.

Came up in:
[POSSIBLE PERFORMANCE IMPACT] Use __builtin_expect on Clang as well (for UNLIKELY and LIKELY)
https://codereview.chromium.org/114933002/
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=163876

[Nils Barth (inactive), 2013-12-13 04:57:10]

Quick cleanup.

[Nico, 2013-12-13 05:04:47]

lgtm

[commit-bot: I haz the power, 2013-12-13 05:10:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/105673006/1

[commit-bot: I haz the power, 2013-12-13 07:30:46]

Retried try job too often on win_blink_rel for step(s) webkit_python_tests,
webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[commit-bot: I haz the power, 2013-12-13 16:57:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/nbarth@chromium.org/105673006/1

[commit-bot: I haz the power, 2013-12-13 16:58:27]

Change committed as 163876