Convert ui::ScaleFactor -> float in favicon/history code

components/favicon_base/favicon_util.h

Index: components/favicon_base/favicon_util.h
diff --git a/components/favicon_base/favicon_util.h b/components/favicon_base/favicon_util.h
index ee59428c22469de6de3f3b6707a7f3de798acc4a..912f06f2f8d2c53363ee7a9fe46dc8e7cdc46917 100644
--- a/components/favicon_base/favicon_util.h
+++ b/components/favicon_base/favicon_util.h
@@ -8,7 +8,6 @@
 #include <vector>
 
 #include "components/favicon_base/favicon_types.h"
-#include "ui/base/layout.h"
 
 namespace gfx {
 class Image;
@@ -16,24 +15,25 @@ class Image;
 
 namespace favicon_base {
 
-// Returns the scale factors at which favicons should be fetched. This is
+// Returns the scales at which favicons should be fetched. This is
 // different from ui::GetSupportedScaleFactors() because clients which do
 // not support 1x should still fetch a favicon for 1x to push to sync. This
 // guarantees that the clients receiving sync updates pushed by this client
 // receive a favicon (potentially of the wrong scale factor) and do not show
 // the default favicon.
-std::vector<ui::ScaleFactor> GetFaviconScaleFactors();
+std::vector<float> GetFaviconScales();
 
 // Sets the color space used for converting |image| to an NSImage to the
 // system colorspace. This makes the favicon look the same in the browser UI
 // as it does in the renderer.
 void SetFaviconColorSpace(gfx::Image* image);
 
-// Takes a vector of png-encoded frames, decodes them, and converts them to
-// a favicon of size favicon_size (in DIPs) at the desired ui scale factors.
+// Takes a vector of PNG-encoded frames, and converts it to a gfx::Image of
+// size |favicon_size| in DIPS. The result gfx::Image has a gfx::ImageSkia with
+// gfx::ImageSkiaReps for each |favicon_scales|.
 gfx::Image SelectFaviconFramesFromPNGs(
     const std::vector<favicon_base::FaviconRawBitmapResult>& png_data,
-    const std::vector<ui::ScaleFactor>& scale_factors,
+    const std::vector<float>& favicon_scales,
     int favicon_size);
 
 }  // namspace favicon_base