CPP: Fix PhoneNumberMatcher build in Chrome.

Contributors:
  - leandrogracia@chromium.org
  - georgey@chromium.org

Review URL: https://codereview.appspot.com/5627046

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk/cpp/src/phonenumbers@424 ee073f10-1060-11df-b6a4-87a95322a99c
diff --git a/phonenumbermatcher.cc b/phonenumbermatcher.cc
index 0430699..9b380d3 100644
--- a/phonenumbermatcher.cc
+++ b/phonenumbermatcher.cc
@@ -207,7 +207,7 @@
   scoped_ptr<const RegExp> pattern_;
 
 #ifdef USE_GOOGLE_BASE
-  PhoneNumberMatcherRegExps* PhoneNumberMatcherRegExps::GetInstance() {
+  static PhoneNumberMatcherRegExps* GetInstance() {
     return Singleton<PhoneNumberMatcherRegExps>::get();
   }
 #endif  // USE_GOOGLE_BASE