[EFL] Simplify SharedBuffer::createWithContentsOfFile() implementation

[EFL] Simplify SharedBuffer::createWithContentsOfFile() implementation
https://bugs.webkit.org/show_bug.cgi?id=89655

Patch by Christophe Dumez <christophe.dumez@intel.com> on 2012-06-26
Reviewed by Csaba Osztrogonác.

Simplify the implementation of SharedBuffer::createWithContentsOfFile()
in EFL port.

No new test, no behavior change.

* platform/efl/SharedBufferEfl.cpp:
(WebCore::SharedBuffer::createWithContentsOfFile):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121254 268f45cc-cd09-0410-ab3c-d52691b4dbfc