Fix GetUserAgent
Fix GetUserAgent

ISSUE : CBWEBCORE-440

Change-Id: Ic2e2d631509abba2c2b0daabf563d3abfed17a82

crosswalk-project/chromium-efl,hgl888/chromium-efl,hgl888/chromium-efl,hgl888/chromium-efl,crosswalk-project/chromium-efl,hgl888/chromium-efl,crosswalk-project/chromium-efl,crosswalk-project/chromium-efl,hgl888/chromium-efl