[CleanUp] Use base::STLSetDifference in place of std::set_difference

ui/base/test/ui_cocoa_test_helper.mm

Index: ui/base/test/ui_cocoa_test_helper.mm
diff --git a/ui/base/test/ui_cocoa_test_helper.mm b/ui/base/test/ui_cocoa_test_helper.mm
index 478aa31edaf4156ad4fe132be1d6e757a73d0bef..0f3e6e3c9f8e3cd68b6f8dd36046dbd6bcf04027 100644
--- a/ui/base/test/ui_cocoa_test_helper.mm
+++ b/ui/base/test/ui_cocoa_test_helper.mm
@@ -179,10 +179,8 @@ std::set<NSWindow*> CocoaTest::ApplicationWindows() {
 
 std::set<NSWindow*> CocoaTest::WindowsLeft() {
   const std::set<NSWindow*> windows(ApplicationWindows());
-  std::set<NSWindow*> windows_left;
-  std::set_difference(windows.begin(), windows.end(),
-                      initial_windows_.begin(), initial_windows_.end(),
-                      std::inserter(windows_left, windows_left.begin()));
+  std::set<NSWindow*> windows_left =
+      base::STLSetDifference<NSWindow*>(windows, initial_windows);

[Lei Zhang, 2013/08/10 08:26:10]

typo

[Haojian Wu, 2013/08/10 09:47:29]

Done.

   return windows_left;
 }