Change other usages of .size() to .empty() when applicable.

net/base/cookie_monster.cc

 // Copyright (c) 2010 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.
 
 // Portions of this code based on Mozilla:
 //   (netwerk/cookie/src/nsCookieService.cpp)
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
@@ skipping 1561 matching lines @@
       maxage_index_(0),
       secure_index_(0),
       httponly_index_(0) {
 
   if (cookie_line.size() > kMaxCookieSize) {
     VLOG(1) << "Not parsing cookie, too large: " << cookie_line.size();
     return;
   }
 
   ParseTokenValuePairs(cookie_line);
-  if (pairs_.size() > 0) {
+  if (!pairs_.empty()) {
     is_valid_ = true;
     SetupAttributes();
   }
 }
 
 CookieMonster::ParsedCookie::~ParsedCookie() {
 }
 
 // Returns true if |c| occurs in |chars|
 // TODO maybe make this take an iterator, could check for end also?
@@ skipping 441 matching lines @@
 std::string CookieMonster::CanonicalCookie::DebugString() const {
   return base::StringPrintf(
       "name: %s value: %s domain: %s path: %s creation: %"
       PRId64,
       name_.c_str(), value_.c_str(),
       domain_.c_str(), path_.c_str(),
       static_cast<int64>(creation_date_.ToTimeT()));
 }
 
 }  // namespace