Fix some grammatical errors in webkit/

webkit/database/database_tracker.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 "webkit/database/database_tracker.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 187 matching lines @@
 }
 
 void DatabaseTracker::CloseDatabases(const DatabaseConnections& connections) {
   if (database_connections_.IsEmpty()) {
     DCHECK(!is_initialized_ || connections.IsEmpty());
     return;
   }
 
   // When being closed by this route, there's a chance that
   // the tracker missed some DatabseModified calls. This method is used
-  // when a renderer crashes to cleanup it's open resources.
+  // when a renderer crashes to cleanup its open resources.
   // We need to examine what we have in connections for the
   // size of each open databases and notify any differences between the
   // actual file sizes now.
   std::vector<std::pair<string16, string16> > open_dbs;
   connections.ListConnections(&open_dbs);
   for (std::vector<std::pair<string16, string16> >::iterator it =
            open_dbs.begin(); it != open_dbs.end(); ++it)
     UpdateOpenDatabaseSizeAndNotify(it->first, it->second);
 
   std::vector<std::pair<string16, string16> > closed_dbs;
@@ skipping 675 matching lines @@
   if (!db_tracker_thread_->BelongsToCurrentThread()) {
     db_tracker_thread_->PostTask(
         FROM_HERE,
         base::Bind(&DatabaseTracker::SaveSessionState, this));
     return;
   }
   save_session_state_ = true;
 }
 
 }  // namespace webkit_database