Move permission warning message handling from PermissionSet to PermissionMessageProvider.

chrome/common/extensions/permissions/permission_message_util.h

Index: chrome/common/extensions/permissions/permission_message_util.h
diff --git a/chrome/common/extensions/permissions/permission_message_util.h b/chrome/common/extensions/permissions/permission_message_util.h
index 1ff5a5ade5717484464643c9e77c6db7830321c4..13b41c196ee6df48f95034c74725e39359168820 100644
--- a/chrome/common/extensions/permissions/permission_message_util.h
+++ b/chrome/common/extensions/permissions/permission_message_util.h
@@ -10,6 +10,8 @@
 
 namespace extensions {
 class PermissionMessage;
+class PermissionSet;
+class URLPatternSet;
 }
 
 namespace permission_message_util {
@@ -19,6 +21,11 @@ namespace permission_message_util {
 extensions::PermissionMessage CreateFromHostList(
     const std::set<std::string>& hosts);
 
+std::set<std::string> GetDistinctHosts(
+    const extensions::URLPatternSet& host_patterns,
+    bool include_rcd,
+    bool exclude_file_scheme);
+
 }  // namespace permission_message_util
 
 #endif  // CHROME_COMMON_EXTENSIONS_PERMISSIONS_PERMISSION_MESSAGE_UTIL_H_