Move IsValidOriginIdentifier into appropriate header

storage/common/database/database_identifier.cc

Index: storage/common/database/database_identifier.cc
diff --git a/storage/common/database/database_identifier.cc b/storage/common/database/database_identifier.cc
index 2c1aa552270dcd7cf78b6a031f7114ec7223cc30..8eb498ae1b0cac34bf1a27e44a13c532481947f1 100644
--- a/storage/common/database/database_identifier.cc
+++ b/storage/common/database/database_identifier.cc
@@ -23,6 +23,11 @@ GURL GetOriginFromIdentifier(const std::string& identifier) {
   return DatabaseIdentifier::Parse(identifier).ToOrigin();
 }
 
+// static
+bool IsValidOriginIdentifier(const std::string& identifier) {
+  return GetOriginFromIdentifier(identifier).is_valid();
+}
+
 static bool SchemeIsUnique(const std::string& scheme) {
   return scheme == "about" || scheme == "data" || scheme == "javascript";
 }