Remove profile-based per-host & default zoom level migration code.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 2ecf6081ff3be03e899c27612bb4ddabb76b6e12..8c0a5b6ce75512bfddbcec4be908829c018d50aa 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -965,15 +965,10 @@ const char kClearSiteDataOnExit[] = "profile.clear_site_data_on_exit";
 
 // Double that indicates the default zoom level.
 const char kPartitionDefaultZoomLevel[] = "partition.default_zoom_level";
-// TODO(wjmaclean): Remove this once sufficient users have migrated to the
-// per-StoragePartition zoom levels. http://crbug.com/420643.
-const char kDefaultZoomLevelDeprecated[] = "profile.default_zoom_level";
 
 // Dictionary that maps hostnames to zoom levels.  Hosts not in this pref will
 // be displayed at the default zoom level.
 const char kPartitionPerHostZoomLevels[] = "partition.per_host_zoom_levels";
-// TODO(wjmaclean): Remove this.
-const char kPerHostZoomLevelsDeprecated[] = "profile.per_host_zoom_levels";
 
 // A dictionary that tracks the default data model to use for each section of
 // the dialog.