fix(test): Android browser does not support calc() a CSS unit value

Closes #5001

modules/angular2/test/core/compiler/shadow_css_spec.ts

@@ -165,10 +165,13 @@ export function main() {
       });
     }
 
+    // Android browser does not support calc(), see http://caniuse.com/#feat=calc
+    if (!browserDetection.isAndroid) {
       it('should leave calc() unchanged', () => {
         var styleStr = 'a {height:calc(100% - 55px);}';
         var css = s(styleStr, 'a');
         expect(css).toEqual(styleStr);
       });
+    }
   });
 }