Fix some grammar in chrome/browser/printing

chrome/browser/printing/print_dialog_cloud.cc

 // 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.
 
 #include "chrome/browser/printing/print_dialog_cloud.h"
 #include "chrome/browser/printing/print_dialog_cloud_internal.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 270 matching lines @@
 
 CloudPrintFlowHandler::~CloudPrintFlowHandler() {
   // This will also cancel any task in flight.
   CancelAnyRunningTask();
 }
 
 
 void CloudPrintFlowHandler::SetDialogDelegate(
     CloudPrintHtmlDialogDelegate* delegate) {
   // Even if setting a new WebUI, it means any previous task needs
-  // to be cancelled, it's now invalid.
+  // to be canceled, its now invalid.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   CancelAnyRunningTask();
   dialog_delegate_ = delegate;
 }
 
 // Cancels any print data sender we have in flight and removes our
 // reference to it, so when the task that is calling it finishes and
-// removes it's reference, it goes away.
+// removes its reference, it goes away.
 void CloudPrintFlowHandler::CancelAnyRunningTask() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (print_data_sender_.get()) {
     print_data_sender_->CancelPrintDataFile();
     print_data_sender_ = NULL;
   }
 }
 
 void CloudPrintFlowHandler::RegisterMessages() {
   // TODO(scottbyer) - This is where we will register messages for the
@@ skipping 225 matching lines @@
 
   flow_handler_->SetDialogDelegate(this);
   // If we're not modal we can show the dialog with no browser.
   // We need this to keep Chrome alive while our dialog is up.
   if (!modal_)
     BrowserList::StartKeepAlive();
 }
 
 CloudPrintHtmlDialogDelegate::~CloudPrintHtmlDialogDelegate() {
   // If the flow_handler_ is about to outlive us because we don't own
-  // it anymore, we need to have it remove it's reference to us.
+  // it anymore, we need to have it remove its reference to us.
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   flow_handler_->SetDialogDelegate(NULL);
   if (owns_flow_handler_) {
     delete flow_handler_;
   }
 }
 
 ui::ModalType CloudPrintHtmlDialogDelegate::GetDialogModalType() const {
     return modal_ ? ui::MODAL_TYPE_WINDOW : ui::MODAL_TYPE_NONE;
 }
@@ skipping 279 matching lines @@
                                                    file_type,
                                                    false,
                                                    delete_on_close);
       return true;
     }
   }
   return false;
 }
 
 }  // end namespace