Fix some grammatical errors in comments in net/

net/cookies/cookie_monster.h

 // 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.
 
 // Brought to you by the letter D and the number 2.
 
 #ifndef NET_COOKIES_COOKIE_MONSTER_H_
 #define NET_COOKIES_COOKIE_MONSTER_H_
 #pragma once
 
@@ skipping 786 matching lines @@
     CHANGE_COOKIE_EXPIRED,
     // The cookie was automatically evicted during garbage collection.
     CHANGE_COOKIE_EVICTED,
     // The cookie was overwritten with an already-expired expiration date.
     CHANGE_COOKIE_EXPIRED_OVERWRITE
   };
 
   // Will be called when a cookie is added or removed. The function is passed
   // the respective |cookie| which was added to or removed from the cookies.
   // If |removed| is true, the cookie was deleted, and |cause| will be set
-  // to the reason for it's removal. If |removed| is false, the cookie was
+  // to the reason for its removal. If |removed| is false, the cookie was
   // added, and |cause| will be set to CHANGE_COOKIE_EXPLICIT.
   //
   // As a special case, note that updating a cookie's properties is implemented
   // as a two step process: the cookie to be updated is first removed entirely,
   // generating a notification with cause CHANGE_COOKIE_OVERWRITE.  Afterwards,
   // a new cookie is written with the updated values, generating a notification
   // with cause CHANGE_COOKIE_EXPLICIT.
   virtual void OnCookieChanged(const CookieMonster::CanonicalCookie& cookie,
                                bool removed,
                                ChangeCause cause) = 0;
@@ skipping 144 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(PersistentCookieStore);
 };
 
 class CookieList : public std::vector<CookieMonster::CanonicalCookie> {
 };
 
 }  // namespace net
 
 #endif  // NET_COOKIES_COOKIE_MONSTER_H_