http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/WebCore.gyp/WebCore.gyp:
If set to 1, doesn't compile debug symbols into webcore reducing
the size of the binary and increasing the speed of gdb. gcc only.
%{?with_shared_libs:-Dlibrary=shared_library} \
-Dbuild_ffmpegsumo=%{?with_ffmpegsumo:1}%{!?with_ffmpegsumo:0} \
-Dffmpeg_branding=Chrome \
+ -Dremove_webcore_debug_symbols=1 \
-Dproprietary_codecs=1 \
%if %{with nacl}
-Ddisable_glibc=1 \