Fix 'except' and 'prefer' spelling.

chrome/browser/process_singleton.h

 // 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.
 
 #ifndef CHROME_BROWSER_PROCESS_SINGLETON_H_
 #define CHROME_BROWSER_PROCESS_SINGLETON_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 64 matching lines @@
   // process or have grabbed the singleton (unless the profile is locked by an
   // unreachable process).
   // TODO(brettw): Make the implementation of this method non-platform-specific
   // by making Linux re-use the Windows implementation.
   NotifyResult NotifyOtherProcessOrCreate();
 
   // Sets ourself up as the singleton instance.  Returns true on success.  If
   // false is returned, we are not the singleton instance and the caller must
   // exit.
   // NOTE: Most callers should generally prefer NotifyOtherProcessOrCreate() to
-  // this method, only callers for whom failure is prefered to notifying another
-  // process should call this directly.
+  // this method, only callers for whom failure is preferred to notifying
+  // another process should call this directly.
   bool Create();
 
   // Clear any lock state during shutdown.
   void Cleanup();
 
 #if defined(OS_POSIX) && !defined(OS_ANDROID)
   static void DisablePromptForTesting();
 #endif
 
  protected:
@@ skipping 71 matching lines @@
   // Helper class for linux specific messages.  LinuxWatcher is ref counted
   // because it posts messages between threads.
   class LinuxWatcher;
   scoped_refptr<LinuxWatcher> watcher_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ProcessSingleton);
 };
 
 #endif  // CHROME_BROWSER_PROCESS_SINGLETON_H_