Remove two useless attributes that snuck in while https://codereview.chromium.org/1221073004 was in…

components/proxy_config/proxy_prefs.h

 // Copyright (c) 2011 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.
 
 #ifndef COMPONENTS_PROXY_CONFIG_PROXY_PREFS_H_
 #define COMPONENTS_PROXY_CONFIG_PROXY_PREFS_H_
 
 #include <string>
 
 #include "components/proxy_config/proxy_config_export.h"
 
 namespace ProxyPrefs {
 
 // Possible types of specifying proxy settings. Do not change the order of
 // the constants, because numeric values are exposed to users.
 // If you add an enum constant, you should also add a string to
 // kProxyModeNames in the .cc file.
-enum PROXY_CONFIG_EXPORT ProxyMode {
+enum ProxyMode {
   // Direct connection to the network, other proxy preferences are ignored.
   MODE_DIRECT = 0,
 
   // Try to retrieve a PAC script from http://wpad/wpad.dat or fall back to
   // direct connection.
   MODE_AUTO_DETECT = 1,
 
   // Try to retrieve a PAC script from kProxyPacURL or fall back to direct
   // connection.
   MODE_PAC_SCRIPT = 2,
 
   // Use the settings specified in kProxyServer and kProxyBypassList.
   MODE_FIXED_SERVERS = 3,
 
   // The system's proxy settings are used, other proxy preferences are
   // ignored.
   MODE_SYSTEM = 4,
 
   kModeCount
 };
 
 // State of proxy configuration.
-enum PROXY_CONFIG_EXPORT ConfigState {
+enum ConfigState {
   // Configuration is from policy.
   CONFIG_POLICY,
   // Configuration is from extension.
   CONFIG_EXTENSION,
   // Configuration is not from policy or extension but still precedes others.
   CONFIG_OTHER_PRECEDE,
   // Configuration is from system.
   CONFIG_SYSTEM,
   // Configuration is recommended i.e there's a fallback configuration.
   CONFIG_FALLBACK,
@@ skipping 12 matching lines @@
 PROXY_CONFIG_EXPORT bool IntToProxyMode(int in_value, ProxyMode* out_value);
 PROXY_CONFIG_EXPORT bool StringToProxyMode(const std::string& in_value,
                                            ProxyMode* out_value);
 // Ownership of the return value is NOT passed to the caller.
 PROXY_CONFIG_EXPORT const char* ProxyModeToString(ProxyMode mode);
 PROXY_CONFIG_EXPORT std::string ConfigStateToDebugString(ConfigState state);
 
 }  // namespace ProxyPrefs
 
 #endif  // COMPONENTS_PROXY_CONFIG_PROXY_PREFS_H_