GSS Conversion bug with several undefined constants.

The converter fails to convert everything in lower case when a 
property value contains several uppercase strings that don't 
match constants.

Bug: issue 8963
Change-Id: Ief059cb704bd312dd32508d1ada853874c9c7832
(cherry picked from commit 551d490fb98831848f2d2bc7a1e81ac59ef48ff5)
diff --git a/user/src/com/google/gwt/resources/converter/UndefinedConstantVisitor.java b/user/src/com/google/gwt/resources/converter/UndefinedConstantVisitor.java
index 956d301..d37d037 100644
--- a/user/src/com/google/gwt/resources/converter/UndefinedConstantVisitor.java
+++ b/user/src/com/google/gwt/resources/converter/UndefinedConstantVisitor.java
@@ -79,7 +79,6 @@
                 + cssProperty.getName() + "' from rule '" + x.getSelectors().toString()
                 + "' undefined constant: " + upperCaseString);
           }
-          break;
         }
       }
 
diff --git a/user/test/com/google/gwt/resources/converter/undefined-constants.css b/user/test/com/google/gwt/resources/converter/undefined-constants.css
index d6b263d..55ae751 100644
--- a/user/test/com/google/gwt/resources/converter/undefined-constants.css
+++ b/user/test/com/google/gwt/resources/converter/undefined-constants.css
@@ -3,3 +3,7 @@
   color: JFK_MY_STUFF;
   background-color: JFK_123_ASD;
 }
+
+.cellTableHeader {
+  padding: HEADER_VERTICAL_PADDING HEADER_HORIZONTAL_PADDING;
+}
diff --git a/user/test/com/google/gwt/resources/converter/undefined-constants.gss b/user/test/com/google/gwt/resources/converter/undefined-constants.gss
index 0813069..9f977a9 100644
--- a/user/test/com/google/gwt/resources/converter/undefined-constants.gss
+++ b/user/test/com/google/gwt/resources/converter/undefined-constants.gss
@@ -4,3 +4,7 @@
   color: jfk_my_stuff;
   background-color: jfk_123_asd;
 }
+
+.cellTableHeader {
+  padding: header_vertical_padding header_horizontal_padding;
+}