Implementing EvictedDomainCookieCounter to keep user metrics on cookie eviction and reinstatement.

net/cookies/cookie_monster.h

Index: net/cookies/cookie_monster.h
diff --git a/net/cookies/cookie_monster.h b/net/cookies/cookie_monster.h
index e39cfe1b4f3ab81e9c6ad1aa83b08b27adbfa34d..9066b840f0f01057a6f9104e62a347ec8f8af3d9 100644
--- a/net/cookies/cookie_monster.h
+++ b/net/cookies/cookie_monster.h
@@ -646,7 +646,7 @@ class NET_EXPORT CookieMonster : public CookieStore {
   DISALLOW_COPY_AND_ASSIGN(CookieMonster);
 };
 
-class CookieMonster::Delegate
+class NET_EXPORT CookieMonster::Delegate
     : public base::RefCountedThreadSafe<CookieMonster::Delegate> {
  public:
   // The publicly relevant reasons a cookie might be changed.