Revert 168079 - This CL ensures that favicons always

chrome/browser/extensions/extension_install_prompt.cc

Index: chrome/browser/extensions/extension_install_prompt.cc
===================================================================
--- chrome/browser/extensions/extension_install_prompt.cc	(revision 168086)
+++ chrome/browser/extensions/extension_install_prompt.cc	(working copy)
@@ -104,16 +104,26 @@
 // Returns pixel size under maximal scale factor for the icon whose device
 // independent size is |size_in_dip|
 int GetSizeForMaxScaleFactor(int size_in_dip) {
-  float max_scale_factor_scale =
-      ui::GetScaleFactorScale(ui::GetMaxScaleFactor());
+  std::vector<ui::ScaleFactor> supported_scale_factors =
+      ui::GetSupportedScaleFactors();
+  // Scale factors are in ascending order, so the last one is the one we need.
+  ui::ScaleFactor max_scale_factor = supported_scale_factors.back();
+  float max_scale_factor_scale = ui::GetScaleFactorScale(max_scale_factor);
+
   return static_cast<int>(size_in_dip * max_scale_factor_scale);
 }
 
 // Returns bitmap for the default icon with size equal to the default icon's
 // pixel size under maximal supported scale factor.
 SkBitmap GetDefaultIconBitmapForMaxScaleFactor(bool is_app) {
+  std::vector<ui::ScaleFactor> supported_scale_factors =
+      ui::GetSupportedScaleFactors();
+  // Scale factors are in ascending order, so the last one is the one we need.
+  ui::ScaleFactor max_scale_factor =
+      supported_scale_factors[supported_scale_factors.size() - 1];
+
   return Extension::GetDefaultIcon(is_app).
-      GetRepresentation(ui::GetMaxScaleFactor()).sk_bitmap();
+      GetRepresentation(max_scale_factor).sk_bitmap();
 }
 
 // If auto confirm is enabled then posts a task to proceed with or cancel the