[EFL] Remove redundant pipe write to prevent pipe buffer full.

[EFL] Remove redundant pipe write to prevent pipe buffer full.
https://bugs.webkit.org/show_bug.cgi?id=101135

Patch by Byungwoo Lee <bw80.lee@samsung.com> on 2012-12-13
Reviewed by Gyuyoung Kim.

To prevent a source of a deadlock, remove the redundant pipe write
in wakeUp() function.

EFL uses ecore_pipe_write() to wake up main run loop, and the function
uses POSIX pipe write with O_NONBLOCK disabled.
With O_NONBLOCK disabled, when written data is more than PIPE_BUF,
pipe write will be blocked until it can be written.

Currently, every wakeUp() function calls ecore_pipe_write() to invoke
wakeUpEvent() callback. And this can make pipe buffer full status
which is the one reason of the lockup problem described in Bug 99494.

* platform/RunLoop.h:
(RunLoop):
* platform/efl/RunLoopEfl.cpp:
(WebCore::RunLoop::RunLoop):
(WebCore::RunLoop::wakeUpEvent):
(WebCore::RunLoop::wakeUp):

Change-Id: I0c46a64d885c929cb2ac265d4b0da020cd3db9a7
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@137580 268f45cc-cd09-0410-ab3c-d52691b4dbfc