Add WOW64 support and DeleteEmptyKey to base::win::registry.

base/win/registry.h

Index: base/win/registry.h
diff --git a/base/win/registry.h b/base/win/registry.h
index 2ef759bf4cba5724b0caa2c1ab77f60f76f1aebc..bc8d64d5241bcbb8458b8841ab162e26e93d388d 100644
--- a/base/win/registry.h
+++ b/base/win/registry.h
@@ -132,8 +132,12 @@ class BASE_EXPORT RegKey {
   HKEY Handle() const { return key_; }
 
  private:
+  static LONG RegDeleteKeyExWrapper(HKEY hKey, const wchar_t* lpSubKey,

[grt (UTC plus 2), 2014/05/16 15:44:43]

add doc string

[Will Harris, 2014/05/16 22:55:45]

Done.

+                                    REGSAM samDesired, DWORD Reserved);
+  LONG RegDelRecurse(HKEY root_key, std::wstring name, REGSAM access);

[grt (UTC plus 2), 2014/05/16 15:44:43]

add doc string

[Will Harris, 2014/05/16 22:55:45]

Done.

   HKEY key_;  // The registry key being iterated.
   HANDLE watch_event_;
+  REGSAM wow64access_;
 
   DISALLOW_COPY_AND_ASSIGN(RegKey);
 };