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

chrome/browser/ui/cocoa/browser_window_controller_private.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller_private.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/mac/mac_util.h"
@@ skipping 101 matching lines @@
 
   // Only save main window information to preferences.
   PrefService* prefs = browser_->profile()->GetPrefs();
   if (!prefs || browser_ != chrome::GetLastActiveBrowser())
     return;
 
   // Save the current work area, in flipped coordinates.
   gfx::Rect workArea(NSRectToCGRect([windowScreen visibleFrame]));
   workArea.set_y(monitorFrame.size.height - workArea.y() - workArea.height());
 
-  DictionaryPrefUpdate update(
-      prefs,
-      chrome::GetWindowPlacementKey(browser_.get()).c_str());
-  base::DictionaryValue* windowPreferences = update.Get();
+  scoped_ptr<DictionaryPrefUpdate> update =
+      chrome::GetWindowPlacementDictionaryReadWrite(
+          chrome::GetWindowName(browser_.get()),
+          browser_->profile()->GetPrefs());
+  base::DictionaryValue* windowPreferences = update->Get();
   windowPreferences->SetInteger("left", bounds.x());
   windowPreferences->SetInteger("top", bounds.y());
   windowPreferences->SetInteger("right", bounds.right());
   windowPreferences->SetInteger("bottom", bounds.bottom());
   windowPreferences->SetBoolean("maximized", false);
   windowPreferences->SetBoolean("always_on_top", false);
   windowPreferences->SetInteger("work_area_left", workArea.x());
   windowPreferences->SetInteger("work_area_top", workArea.y());
   windowPreferences->SetInteger("work_area_right", workArea.right());
   windowPreferences->SetInteger("work_area_bottom", workArea.bottom());
@@ skipping 1009 matching lines @@
 
 - (void)exitAppKitFullscreen {
   DCHECK(base::mac::IsOSLionOrLater());
   if (FramedBrowserWindow* framedBrowserWindow =
           base::mac::ObjCCast<FramedBrowserWindow>([self window])) {
     [framedBrowserWindow toggleSystemFullScreen];
   }
 }
 
 @end  // @implementation BrowserWindowController(Private)