No longer register app window placement preference keys on the fly.

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 02fa6bd775c635c0a96ee40926f941a295730e05..8a104aa3c791b2ead042c94f0fc0438bc085096f 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1417,6 +1417,14 @@ const char kBrowserWindowPlacementPopup[] = "browser.window_placement_popup";
 // manager window to restore on startup.
 const char kTaskManagerWindowPlacement[] = "task_manager.window_placement";
 
+// A collection of position, size, and other data relating to app windows to
+// restore on startup.
+const char kAppWindowPlacement[] = "browser.app_window_placement";
+
+// An integer specifying the total number of bytes to be used by the
+// renderer's in-memory cache of objects.
+const char kMemoryCacheSize[] = "renderer.memory_cache.size";
+
 // String which specifies where to download files to by default.
 const char kDownloadDefaultDirectory[] = "download.default_directory";