No upper cookie limit. Only per host enforced.

chrome/common/net/cookie_monster_sqlite.cc

 // Copyright (c) 2006-2008 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 "chrome/common/net/cookie_monster_sqlite.h"
 
 #include <list>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 316 matching lines @@
     return false;
   }
 
   if (!EnsureDatabaseVersion(db) || !InitTable(db)) {
     NOTREACHED() << "Unable to initialize cookie DB.";
     sqlite3_close(db);
     return false;
   }
 
   PrimeCache(db);
+  // Size cookies
+  SQLStatement c_smt;
+  if (c_smt.prepare(db,
+      "SELECT count(*) FROM cookies") != SQLITE_OK) {
+    NOTREACHED() << "select statement prep failed";
+    sqlite3_close(db);
+    return false;
+  }
+  while (c_smt.step() == SQLITE_ROW) {
+    cookies->reserve(c_smt.column_int(0));
+  }
+
 
   // Slurp all the cookies into the out-vector.
   SQLStatement smt;
   if (smt.prepare(db,
       "SELECT creation_utc, host_key, name, value, path, expires_utc, secure, "
       "httponly, last_access_utc FROM cookies") != SQLITE_OK) {
     NOTREACHED() << "select statement prep failed";
     sqlite3_close(db);
     return false;
   }
@@ skipping 80 matching lines @@
     const net::CookieMonster::CanonicalCookie& cc) {
   if (backend_.get())
     backend_->UpdateCookieAccessTime(cc);
 }
 
 void SQLitePersistentCookieStore::DeleteCookie(
     const net::CookieMonster::CanonicalCookie& cc) {
   if (backend_.get())
     backend_->DeleteCookie(cc);
 }