Cleanup: Remove unneeded SSE2 checks and unused code.

chrome/browser/upgrade_detector_impl.cc

Index: chrome/browser/upgrade_detector_impl.cc
diff --git a/chrome/browser/upgrade_detector_impl.cc b/chrome/browser/upgrade_detector_impl.cc
index f0e854c88f15c6742dd613a0ac50f5f437b1b44c..8b9629b61c70eca7229ea8a2f89cc6b673473ecc 100644
--- a/chrome/browser/upgrade_detector_impl.cc
+++ b/chrome/browser/upgrade_detector_impl.cc
@@ -9,7 +9,6 @@
 #include "base/bind.h"
 #include "base/build_time.h"
 #include "base/command_line.h"
-#include "base/cpu.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
@@ -404,11 +403,6 @@ bool UpgradeDetectorImpl::DetectOutdatedInstall() {
     // Don't show the update bubbles to enterprise users (i.e., on a domain).
     if (base::win::IsEnrolledToDomain())
       return false;
-
-    // On Windows, we don't want to warn about outdated installs when the
-    // machine doesn't support SSE2, it's been deprecated starting with M35.
-    if (!base::CPU().has_sse2())
-      return false;
 #endif
   }