win: Fix a small language violation.

base/win/registry.h

Index: base/win/registry.h
diff --git a/base/win/registry.h b/base/win/registry.h
index abdf17a343fd70fa357bb08cb38408d19f4e78a3..c8f5da95f781722626b15528dbe9f2897a14479e 100644
--- a/base/win/registry.h
+++ b/base/win/registry.h
@@ -84,8 +84,7 @@ class BASE_EXPORT RegKey {
   // Reads a REG_MULTI_SZ registry field into a vector of strings. Clears
   // |values| initially and adds further strings to the list. Returns
   // ERROR_CANTREAD if type is not REG_MULTI_SZ.
-  LONG RegKey::ReadValues(const wchar_t* name,
-                          std::vector<std::wstring>* values);
+  LONG ReadValues(const wchar_t* name, std::vector<std::wstring>* values);
 
   // Returns raw data. If |name| is NULL or empty, returns the default
   // value, if any.