Fix some grammar in content/common and content/public

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 1270 matching lines @@
 // object contains information about the node(s) that were selected when the
 // user right clicked.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_ContextMenu, content::ContextMenuParams)
 
 // Message to show a popup menu using native cocoa controls (Mac only).
 IPC_MESSAGE_ROUTED1(ViewHostMsg_ShowPopup,
                     ViewHostMsg_ShowPopup_Params)
 
 // Response from ViewMsg_ScriptEvalRequest. The ID is the parameter supplied
 // to ViewMsg_ScriptEvalRequest. The result has the value returned by the
-// script as it's only element, one of Null, Boolean, Integer, Real, Date, or
+// script as its only element, one of Null, Boolean, Integer, Real, Date, or
 // String.
 IPC_MESSAGE_ROUTED2(ViewHostMsg_ScriptEvalResponse,
                     int  /* id */,
                     base::ListValue  /* result */)
 
 // Result of string search in the page.
 // Response to ViewMsg_Find with the results of the requested find-in-page
 // search, the number of matches found and the selection rect (in screen
 // coordinates) for the string found. If |final_update| is false, it signals
 // that this is not the last Find_Reply message - more will be sent as the
@@ skipping 686 matching lines @@
 // have a javascript send a native value (string, number, boolean) to the
 // listener in Cpp. (DomAutomationController)
 IPC_MESSAGE_ROUTED2(ViewHostMsg_DomOperationResponse,
                     std::string  /* json_string */,
                     int  /* automation_id */)
 
 // Enable or disable inverting of web content pixels, for users who prefer
 // white-on-black.
 IPC_MESSAGE_ROUTED1(ViewMsg_InvertWebContent,
                     bool /* invert */)