Fix some grammar in chrome/browser/history

chrome/browser/history/text_database_manager.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/history/text_database_manager.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/metrics/histogram.h"
@@ skipping 219 matching lines @@
   info.set_title(title);
 }
 
 void TextDatabaseManager::AddPageContents(const GURL& url,
                                           const string16& body) {
   RecentChangeList::iterator found = recent_changes_.Peek(url);
   if (found == recent_changes_.end()) {
     // This page is not in our cache of recent pages. This means that the page
     // took more than kExpirationSeconds to load. Often, this will be the result
     // of a very slow iframe or other resource on the page that makes us think
-    // its still loading.
+    // it's still loading.
     //
     // As a fallback, set the most recent visit's contents using the input, and
     // use the last set title in the URL table as the title to index.
     URLRow url_row;
     if (!url_database_->GetRowForURL(url, &url_row))
       return;  // URL is unknown, give up.
     VisitRow visit;
     if (!visit_database_->GetMostRecentVisitForURL(url_row.id(), &visit))
       return;  // No recent visit, give up.
 
@@ skipping 301 matching lines @@
   while (i != recent_changes_.rend() && i->second.Expired(now)) {
     AddPageData(i->first, i->second.url_id(), i->second.visit_id(),
                 i->second.visit_time(), i->second.title(), i->second.body());
     i = recent_changes_.Erase(i);
   }
 
   ScheduleFlushOldChanges();
 }
 
 }  // namespace history