Fix some grammar in chrome/browser/resources/

chrome/browser/net/sqlite_persistent_cookie_store_perftest.cc

 // Copyright (c) 2011 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 "base/bind.h"
 #include "base/message_loop.h"
 #include "base/perftimer.h"
 #include "base/scoped_temp_dir.h"
 #include "base/stringprintf.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 50 matching lines @@
       for (int cookie_num = 0; cookie_num < 50; ++cookie_num) {
         t += base::TimeDelta::FromInternalValue(10);
         store_->AddCookie(
           net::CookieMonster::CanonicalCookie(gurl,
             base::StringPrintf("Cookie_%d", cookie_num), "1",
             domain_name, "/", std::string(), std::string(),
             t, t, t, false, false, true));
       }
     }
     // Replace the store effectively destroying the current one and forcing it
-    // to write it's data to disk.
+    // to write its data to disk.
     store_ = NULL;
     scoped_refptr<base::ThreadTestHelper> helper(
       new base::ThreadTestHelper(
         BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB)));
     // Make sure we wait until the destructor has run.
     ASSERT_TRUE(helper->Run());
 
     store_ = new SQLitePersistentCookieStore(
       temp_dir_.path().Append(chrome::kCookieFilename));
   }
@@ skipping 25 matching lines @@
 }
 
 // Test the performance of load
 TEST_F(SQLitePersistentCookieStorePerfTest, TestLoadPerformance) {
   PerfTimeLogger timer("Load all cookies");
   Load();
   timer.Done();
 
   ASSERT_EQ(15000U, cookies_.size());
 }