TextBreakIterator's should support Latin-1 for all iterator types (Part 2)

TextBreakIterator's should support Latin-1 for all iterator types (Part 2)
https://bugs.webkit.org/show_bug.cgi?id=126856

Reviewed by Ryosuke Niwa.

Move the contents of TextBreakIteratorICU.cpp to TextBreakIterator.cpp and remove TextBreakIteratorICU.cpp.

* CMakeLists.txt:
* GNUmakefile.list.am:
* PlatformGTK.cmake:
* WebCore.vcxproj/WebCore.vcxproj:
* WebCore.vcxproj/WebCore.vcxproj.filters:
* WebCore.xcodeproj/project.pbxproj:
* platform/text/TextBreakIterator.cpp:
* platform/text/TextBreakIteratorICU.cpp: Removed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@162109 268f45cc-cd09-0410-ab3c-d52691b4dbfc