webapps: allow callers of icon downloader/selector to specify a minimum size

chrome/browser/manifest/manifest_icon_downloader.cc

Index: chrome/browser/manifest/manifest_icon_downloader.cc
diff --git a/chrome/browser/manifest/manifest_icon_downloader.cc b/chrome/browser/manifest/manifest_icon_downloader.cc
index 5746a52507484788fb3f40bb0cc1b441f78f29fb..e1e8f4e3203b4ec15ad6cc5fe65ee4db9bd4db2d 100644
--- a/chrome/browser/manifest/manifest_icon_downloader.cc
+++ b/chrome/browser/manifest/manifest_icon_downloader.cc
@@ -16,6 +16,7 @@ bool ManifestIconDownloader::Download(
     content::WebContents* web_contents,
     const GURL& icon_url,
     int ideal_icon_size_in_dp,
+    int minimum_icon_size_in_dp,
     const ManifestIconDownloader::IconFetchCallback& callback) {
   if (!web_contents || !icon_url.is_valid())
     return false;
@@ -27,11 +28,8 @@ bool ManifestIconDownloader::Download(
       screen->GetPrimaryDisplay().device_scale_factor();
   const float ideal_icon_size_in_px =
       ideal_icon_size_in_dp * device_scale_factor;
-
-  const int minimum_scale_factor = std::max(
-      static_cast<int>(floor(device_scale_factor - 1)), 1);
   const float minimum_icon_size_in_px =
-      ideal_icon_size_in_dp * minimum_scale_factor;
+      minimum_icon_size_in_dp * device_scale_factor;
 
   web_contents->DownloadImage(
       icon_url,