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

webkit/plugins/npapi/plugin_lib_mac.mm

 // 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.
 
 #import <Carbon/Carbon.h>
 
 #include "webkit/plugins/npapi/plugin_lib.h"
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/native_library.h"
@@ skipping 201 matching lines @@
       (NSString*)CFBundleGetValueForInfoDictionaryKey(bundle,
       CFSTR("CFBundleShortVersionString"));
 
   if (have_plugin_descs && plugin_descs.size() > 1)
     info->name = UTF8ToUTF16(plugin_descs[1]);
   else
     info->name = UTF8ToUTF16(filename.BaseName().value());
   info->path = filename;
   if (plugin_vers)
     info->version = base::SysNSStringToUTF16(plugin_vers);
-  if (have_plugin_descs && plugin_descs.size() > 0)
+  if (have_plugin_descs && !plugin_descs.empty())
     info->desc = UTF8ToUTF16(plugin_descs[0]);
   else
     info->desc = UTF8ToUTF16(filename.BaseName().value());
   info->enabled = WebPluginInfo::USER_ENABLED;
 
   return true;
 }
 
 }  // anonymous namespace
 
@@ skipping 108 matching lines @@
   if (ReadSTRPluginInfo(filename, bundle.get(), info))
     return true;
 
   // ... or not
 
   return false;
 }
 
 }  // namespace npapi
 }  // namespace webkit