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

components/proxy_config/proxy_prefs.h

Index: components/proxy_config/proxy_prefs.h
diff --git a/components/proxy_config/proxy_prefs.h b/components/proxy_config/proxy_prefs.h
index 25af0bebc05c485b4c2eddaa0c5cf471fb34d933..8af504f5d14980a34108a3194b8428b716510c48 100644
--- a/components/proxy_config/proxy_prefs.h
+++ b/components/proxy_config/proxy_prefs.h
@@ -15,7 +15,7 @@ namespace ProxyPrefs {
 // 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,
 
@@ -38,7 +38,7 @@ enum PROXY_CONFIG_EXPORT ProxyMode {
 };
 
 // State of proxy configuration.
-enum PROXY_CONFIG_EXPORT ConfigState {
+enum ConfigState {
   // Configuration is from policy.
   CONFIG_POLICY,
   // Configuration is from extension.