Fix some grammatical errors in comments in tools/

tools/measure_page_load_time/ie_bho/MeasurePageLoadTimeBHO.h

 // Copyright (c) 2006-2008 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.
 
 // MeasurePageLoadTimeBHO.h : Declaration of the CMeasurePageLoadTimeBHO
 
 #pragma once
 #include "resource.h"       // main symbols
 
 #include <shlguid.h>     // IID_IWebBrowser2, DIID_DWebBrowserEvents2, et
 #include <exdispid.h>    // DISPID_DOCUMENTCOMPLETE, etc.
 
 #include <string>
 
 #include "MeasurePageLoadTime.h"
 
 
 #if defined(_WIN32_WCE) && !defined(_CE_DCOM) && !defined(_CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA)
-#error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM object's and allow use of it's single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
+#error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM objects and allow use of its single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
 #endif
 
 
 
 // CMeasurePageLoadTimeBHO
 
 class ATL_NO_VTABLE CMeasurePageLoadTimeBHO :
         public CComObjectRootEx<CComSingleThreadModel>,
         public CComCoClass<CMeasurePageLoadTimeBHO, &CLSID_MeasurePageLoadTimeBHO>,
         public IObjectWithSiteImpl<CMeasurePageLoadTimeBHO>,
@@ skipping 49 matching lines @@
     HANDLE m_hEvent;
 
     // Socket for accepting incoming connections
     SOCKET m_sockListen;
 
     // Socket for communicating with remote peers
     SOCKET m_sockTransport;
 };
 
 OBJECT_ENTRY_AUTO(__uuidof(MeasurePageLoadTimeBHO), CMeasurePageLoadTimeBHO)