No upper cookie limit. Only per host enforced.

net/base/cookie_monster.cc

Index: net/base/cookie_monster.cc
===================================================================
--- net/base/cookie_monster.cc	(revision 11100)
+++ net/base/cookie_monster.cc	(working copy)
@@ -75,8 +75,6 @@
 // going through the garbage collection process less often.
 static const size_t kNumCookiesPerHost      = 70;  // ~50 cookies
 static const size_t kNumCookiesPerHostPurge = 20;
-static const size_t kNumCookiesTotal        = 1100;  // ~1000 cookies
-static const size_t kNumCookiesTotalPurge   = 100;
 
 // Default minimum delay after updating a cookie's LastAccessDate before we
 // will update it again.
@@ -105,6 +103,9 @@
 }
 
 CookieMonster::~CookieMonster() {
+  GarbageCollectExpired(Time::Now(),
+                        CookieMapItPair(cookies_.begin(), cookies_.end()),
+                        NULL);
   DeleteAll(false);
 }
 
@@ -115,14 +116,14 @@
   // care if it's expired, insert it so it can be garbage collected, removed,
   // and sync'd.
   std::vector<KeyedCanonicalCookie> cookies;
-  // Reserve space for the maximum amount of cookies a database should have.
-  // This prevents multiple vector growth / copies as we append cookies.
-  cookies.reserve(kNumCookiesTotal);
   store_->Load(&cookies);
   for (std::vector<KeyedCanonicalCookie>::const_iterator it = cookies.begin();
        it != cookies.end(); ++it) {
     InternalInsertCookie(it->first, it->second, false);
   }
+  GarbageCollectExpired(Time::Now(),
+                        CookieMapItPair(cookies_.begin(), cookies_.end()),
+                        NULL);
 }
 
 // The system resolution is not high enough, so we can have multiple
@@ -572,14 +573,6 @@
         kNumCookiesPerHost, kNumCookiesPerHostPurge);
   }
 
-  // Collect garbage for everything.
-  if (cookies_.size() > kNumCookiesTotal) {
-    COOKIE_DLOG(INFO) << "GarbageCollect() everything";
-    num_deleted += GarbageCollectRange(current,
-        CookieMapItPair(cookies_.begin(), cookies_.end()), kNumCookiesTotal,
-        kNumCookiesTotalPurge);
-  }
-
   return num_deleted;
 }