Remove definition of _HAS_EXCEPTIONS from source files.

The define _HAS_EXCEPTIONS=0 is only required on Windows and is already set in the SCons build file and Visual Studio project files.
Review URL: http://codereview.chromium.org/67116

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1707 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

samples/process.cc

@@ -27,8 +27,6 @@
 
 #include <v8.h>
 
-// To avoid warnings from <map> on windows we disable exceptions.
-#define _HAS_EXCEPTIONS 0
 #include <string>
 #include <map>
 

src/mksnapshot.cc

@@ -25,8 +25,6 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// To avoid warnings from <map> on windows we disable exceptions.
-#define _HAS_EXCEPTIONS 0
 #include <signal.h>
 #include <string>
 #include <map>