Introduce ChromeZoomLevelPref, make zoom level prefs independent of profile prefs.

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 431de5a7a64924afcccae1eb96b9c03748b19f37..c55f254138d4a87741cfdcc7c3a590b4e8e7f2fb 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1023,11 +1023,15 @@ const char kBlockThirdPartyCookies[] = "profile.block_third_party_cookies";
 const char kClearSiteDataOnExit[] = "profile.clear_site_data_on_exit";
 
 // Double that indicates the default zoom level.
-const char kDefaultZoomLevel[] = "profile.default_zoom_level";
+const char kDefaultZoomLevel[] = "partition.default_zoom_level";
+// TODO(wjmaclean): Remove this.
+const char kProfileDefaultZoomLevel[] = "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 kPerHostZoomLevels[] = "profile.per_host_zoom_levels";
+const char kPerHostZoomLevels[] = "partition.per_host_zoom_levels";
+// TODO(wjmaclean): Remove this.
+const char kProfilePerHostZoomLevels[] = "profile.per_host_zoom_levels";
 
 // A dictionary that tracks the default data model to use for each section of
 // the dialog.