Makes ui::GetSupportedScaleFactors available on platforms other than Mac

ui/base/layout_mac.mm

Index: ui/base/layout_mac.mm
diff --git a/ui/base/layout_mac.mm b/ui/base/layout_mac.mm
index 70ece0ab4924e0d4b3032a227af8e373fb7a42ff..1429f3686454901923077e7021976d58994c9e15 100644
--- a/ui/base/layout_mac.mm
+++ b/ui/base/layout_mac.mm
@@ -16,16 +16,6 @@
 
 namespace {
 
-std::vector<ui::ScaleFactor>& GetSupportedScaleFactorsInternal() {
-  static std::vector<ui::ScaleFactor>* supported_scale_factors =
-      new std::vector<ui::ScaleFactor>();
-  if (supported_scale_factors->empty()) {
-    supported_scale_factors->push_back(ui::SCALE_FACTOR_100P);
-    supported_scale_factors->push_back(ui::SCALE_FACTOR_200P);
-  }
-  return *supported_scale_factors;
-}
-
 float GetScaleFactorScaleForNativeView(gfx::NativeView view) {
   float scale_factor = 1.0f;
   if (NSWindow* window = [view window]) {
@@ -49,19 +39,4 @@ ScaleFactor GetScaleFactorForNativeView(gfx::NativeView view) {
   return GetScaleFactorFromScale(GetScaleFactorScaleForNativeView(view));
 }
 
-std::vector<ScaleFactor> GetSupportedScaleFactors() {
-  return GetSupportedScaleFactorsInternal();
-}
-
-namespace test {
-
-void SetSupportedScaleFactors(
-    const std::vector<ui::ScaleFactor>& scale_factors) {
-  std::vector<ui::ScaleFactor>& supported_scale_factors =
-      GetSupportedScaleFactorsInternal();
-  supported_scale_factors = scale_factors;
-}
-
-}  // namespace test
-
 }  // namespace ui