[GTK] REGRESSION(r166239): The ld version script is not being used
https://bugs.webkit.org/show_bug.cgi?id=135694

Reviewed by Martin Robinson.

.:

Move the symbols filter file from Tools/gtk to Source/cmake and rename
it as gtksymbols.filter. Also updated it, since some of the symbols
exported were renamed.

* Source/cmake/OptionsGTK.cmake:
* Source/cmake/gtksymbols.filter: Renamed from Tools/gtk/symbols.filter.

Source/WebKit2:

* CMakeLists.txt: Add VERSION_SCRIPT to WebKit2 link flags if present.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@172377 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Update HashTable's operator= after r172167 per review comments

* wtf/HashTable.h:
Update the type as suggested by Darin.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@172378 268f45cc-cd09-0410-ab3c-d52691b4dbfc