c++11: Allow lambdas, with some restrictions.

ui/base/layout.cc

Index: ui/base/layout.cc
diff --git a/ui/base/layout.cc b/ui/base/layout.cc
index 0c3802b751b554527f0053af5f6f453b5ea797dc..01c5b00dc72253623016e89742d1384985195365 100644
--- a/ui/base/layout.cc
+++ b/ui/base/layout.cc
@@ -28,10 +28,6 @@ namespace ui {
 
 namespace {
 
-bool ScaleFactorComparator(const ScaleFactor& lhs, const ScaleFactor& rhs){
-  return GetScaleForScaleFactor(lhs) < GetScaleForScaleFactor(rhs);
-}
-
 std::vector<ScaleFactor>* g_supported_scale_factors = NULL;
 
 const float kScaleFactorScales[] = {1.0f, 1.0f, 1.25f, 1.33f, 1.4f, 1.5f, 1.8f,
@@ -49,7 +45,9 @@ void SetSupportedScaleFactors(
   g_supported_scale_factors = new std::vector<ScaleFactor>(scale_factors);
   std::sort(g_supported_scale_factors->begin(),
             g_supported_scale_factors->end(),
-            ScaleFactorComparator);
+            [](ScaleFactor lhs, ScaleFactor rhs) {
+    return GetScaleForScaleFactor(lhs) < GetScaleForScaleFactor(rhs);
+  });
 
   // Set ImageSkia's supported scales.
   std::vector<float> scales;