Exit the installer gracefully if the processor doesn't support SSE2.

chrome/installer/setup/setup_util.cc

Index: chrome/installer/setup/setup_util.cc
diff --git a/chrome/installer/setup/setup_util.cc b/chrome/installer/setup/setup_util.cc
index d21abf97bd2346c222e2da73cc2d007b6fd668c8..1626ab0ed5fe65ee4937e71018bf90531512b96f 100644
--- a/chrome/installer/setup/setup_util.cc
+++ b/chrome/installer/setup/setup_util.cc
@@ -9,6 +9,7 @@
 #include <windows.h>
 
 #include "base/command_line.h"
+#include "base/cpu.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
@@ -449,6 +450,10 @@ bool ContainsUnsupportedSwitch(const CommandLine& cmd_line) {
   return false;
 }
 
+bool IsProcessorSupported() {
+  return base::CPU().has_sse2();
+}
+
 ScopedTokenPrivilege::ScopedTokenPrivilege(const wchar_t* privilege_name)
     : is_enabled_(false) {
   HANDLE temp_handle;