[NaCl SDK] A bunch of spelling fixes.

native_client_sdk/src/libraries/ppapi_main/ppapi_queue.cc

 // Copyright (c) 2013 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.
 
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "ppapi_main/ppapi_queue.h"
 
@@ skipping 17 matching lines @@
   if (array_) return false;
 
   array_ = new void*[queue_size];
   size_ = queue_size;
 
   memset(array_, 0, sizeof(void*) * queue_size);
   return true;
 }
 
 bool PPAPIQueue::AddNewMessage(void* msg) {
-  // Writting a NULL message is illegal
+  // Writing a NULL message is illegal
   assert(array_ != NULL);
   assert(msg != NULL);
 
   // If the slot not empty, the queue must be full.  Calling RemoveStaleMessage
   // may create space by freeing messages that have already been read.
   if (array_[write_] != NULL) return false;
 
   // Write to the spot
   array_[write_] = msg;
 
@@ skipping 39 matching lines @@
 void PPAPIQueue::ReleaseTopMessage(void* msg) {
   // Verify we currently acquire message.
   assert(msg != NULL);
   assert(msg == last_msg_);
 
   last_msg_ = NULL;
 
   // Signal that the message can be freed.
   read_ = (read_ + 1) % size_;
 }