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 51a65b1ff69864e5ca6814309149f0510efc50f2..bb64f22ac22b4e9afb684fce68d7e049ef2b79ca 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1024,11 +1024,15 @@ 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.