Proof-reading comments in base/message_loop/.

base/message_loop/message_pump_mac.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.
 
 // The basis for all native run loops on the Mac is the CFRunLoop.  It can be
 // used directly, it can be used as the driving force behind the similar
 // Foundation NSRunLoop, and it can be used to implement higher-level event
 // loops such as the NSApplication event loop.
 //
 // This file introduces a basic CFRunLoop-based implementation of the
 // MessagePump interface called CFRunLoopBase.  CFRunLoopBase contains all
 // of the machinery necessary to dispatch events to a delegate, but does not
 // implement the specific run loop.  Concrete subclasses must provide their
 // own DoRun and Quit implementations.
 //
 // A concrete subclass that just runs a CFRunLoop loop is provided in
 // MessagePumpCFRunLoop.  For an NSRunLoop, the similar MessagePumpNSRunLoop
 // is provided.
 //
 // For the application's event loop, an implementation based on AppKit's
 // NSApplication event system is provided in MessagePumpNSApplication.
 //
 // Typically, MessagePumpNSApplication only makes sense on a Cocoa
 // application's main thread.  If a CFRunLoop-based message pump is needed on
-// any other thread, one of the other concrete subclasses is preferrable.
+// any other thread, one of the other concrete subclasses is preferable.
 // MessagePumpMac::Create is defined, which returns a new NSApplication-based
 // or NSRunLoop-based MessagePump subclass depending on which thread it is
 // called on.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_MAC_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_MAC_H_
 
 #include "base/message_loop/message_pump.h"
 
 #include "base/basictypes.h"
@@ skipping 308 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(MessagePumpMac);
 };
 
 // Tasks posted to the message loop are posted under this mode, as well
 // as kCFRunLoopCommonModes.
 extern const CFStringRef BASE_EXPORT kMessageLoopExclusiveRunLoopMode;
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_MAC_H_