Pull in upstream fix from Prototype, patch by fredj (thanks fredj!) to fix

String.prototype.trim. (Closes #961) Note that we should also be more careful
not to clobber other library prototypes. (See #962) I'm going to check this
in to fix the bug for 2.5, and we'll work on the latter in 2.6. 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@4213 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/test_BaseTypes.html

@@ -28,7 +28,7 @@
     }
     
     function test_03_String_trim(t) {
-        t.plan(4);
+        t.plan(5);
         
         var str = "chickenHead";
         t.eq(str.trim(), "chickenHead", "string with no extra whitespace is left alone");
@@ -42,6 +42,8 @@
         str = "  chickenHead    ";
         t.eq(str.trim(), "chickenHead", "string with extra whitespace at beginning and end is trimmed correctly");
 
+        str = " ";
+        t.eq(str.trim(), "", "whitespace string is trimmed correctly");
     }
     
     function test_04_String_indexOf(t) {