[Windows][Linux] Limit min/max zoom from viewport meta
[Windows][Linux] Limit min/max zoom from viewport meta

This patch brings 'user agent' values which override page
min and max zoom from meta viewport tag.

BUG=XWALK-6269

crosswalk-project/crosswalk,rakuco/crosswalk,crosswalk-project/crosswalk,dreamsxin/crosswalk,axinging/crosswalk,xzhan96/crosswalk,darktears/crosswalk,axinging/crosswalk,rakuco/crosswalk,baleboy/crosswalk,dreamsxin/crosswalk,lincsoon/crosswalk,crosswalk-project/crosswalk,heke123/crosswalk,axinging/crosswalk,lincsoon/crosswalk,rakuco/crosswalk,xzhan96/crosswalk,xzhan96/crosswalk,crosswalk-project/crosswalk,lincsoon/crosswalk,heke123/crosswalk,axinging/crosswalk,darktears/crosswalk,crosswalk-project/crosswalk,rakuco/crosswalk,lincsoon/crosswalk,darktears/crosswalk,xzhan96/crosswalk,rakuco/crosswalk,axinging/crosswalk,lincsoon/crosswalk,lincsoon/crosswalk,heke123/crosswalk,baleboy/crosswalk,axinging/crosswalk,axinging/crosswalk,hgl888/crosswalk,xzhan96/crosswalk,rakuco/crosswalk,PeterWangIntel/crosswalk,darktears/crosswalk,heke123/crosswalk,baleboy/crosswalk,dreamsxin/crosswalk,rakuco/crosswalk,PeterWangIntel/crosswalk,rakuco/crosswalk,baleboy/crosswalk,xzhan96/crosswalk,darktears/crosswalk,PeterWangIntel/crosswalk,heke123/crosswalk,crosswalk-project/crosswalk,crosswalk-project/crosswalk,dreamsxin/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,baleboy/crosswalk,heke123/crosswalk,dreamsxin/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,crosswalk-project/crosswalk,hgl888/crosswalk,dreamsxin/crosswalk,hgl888/crosswalk,darktears/crosswalk,heke123/crosswalk,darktears/crosswalk,dreamsxin/crosswalk,heke123/crosswalk,darktears/crosswalk,lincsoon/crosswalk,PeterWangIntel/crosswalk,baleboy/crosswalk,baleboy/crosswalk,hgl888/crosswalk,xzhan96/crosswalk,lincsoon/crosswalk,hgl888/crosswalk,xzhan96/crosswalk,PeterWangIntel/crosswalk,hgl888/crosswalk,baleboy/crosswalk