Unreviewed, rolling out r171957.
https://bugs.webkit.org/show_bug.cgi?id=135538

Caused GTK assertions and test failures (Requested by smfr on
#webkit).

Reverted changeset:

"Clean up image subsampling code, make it less iOS-specific"
https://bugs.webkit.org/show_bug.cgi?id=134916
http://trac.webkit.org/changeset/171957

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171964 268f45cc-cd09-0410-ab3c-d52691b4dbfc
<rdar://problem/17891752> [iOS] WebKit links against libraries it doesn’t use
https://bugs.webkit.org/show_bug.cgi?id=135536

Reviewed by Tim Horton.


Source/WebKit/mac: 
* Configurations/WebKitLegacy.xcconfig: Removed -framework MobileAsset from
OTHER_LDFLAGS_iphoneos.

Source/WebKit2: 
* Configurations/WebKit.xcconfig: Removed -lassertion_extension and -framework MobileAsset
from FRAMEWORK_AND_LIBRARY_LDFLAGS_iphonesimulator.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171965 268f45cc-cd09-0410-ab3c-d52691b4dbfc