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

chrome/common/web_apps_unittest.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.
 
 #include "chrome/common/web_apps.h"
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
@@ skipping 160 matching lines @@
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(data); ++i) {
     bool is_any;
     std::vector<gfx::Size> sizes;
     bool result = web_apps::ParseIconSizes(ASCIIToUTF16(data[i].input), &sizes,
                                            &is_any);
     ASSERT_EQ(result, data[i].expected_result);
     if (result) {
       ASSERT_EQ(data[i].is_any, is_any);
       ASSERT_EQ(data[i].expected_size_count, sizes.size());
-      if (sizes.size() > 0) {
+      if (!sizes.empty()) {
         ASSERT_EQ(data[i].width1, sizes[0].width());
         ASSERT_EQ(data[i].height1, sizes[0].height());
       }
       if (sizes.size() > 1) {
         ASSERT_EQ(data[i].width2, sizes[1].width());
         ASSERT_EQ(data[i].height2, sizes[1].height());
       }
     }
   }
 }