fix(uiGridHeader): Use parseInt on header heights

We were using parseInt but not in the right place, so browsers that use
fractional pixel values were not allowing the header to shrink
appropriately.

src/features/selection/test/uiGridSelectionDirective.spec.js

@@ -83,8 +83,6 @@ describe('ui.grid.selection uiGridSelectionDirective', function() {
     it("doesn't prevent headers from shrinking when filtering gets turned off", function () {
       // Header height with filtering on
       var filteringHeight = $(elm).find('.ui-grid-header').height();
-
-      dump(elm.controller('uiGrid').grid.api.core.notifyDataChange);
 
       parentScope.options.enableFiltering = false;
       elm.controller('uiGrid').grid.api.core.notifyDataChange( uiGridConstants.dataChange.COLUMN );

src/js/core/factories/Grid.js

@@ -1860,9 +1860,7 @@ angular.module('ui.grid')
 
           if (container.header) {
             var oldHeaderHeight = container.headerHeight;
-            var headerHeight = gridUtil.outerElementHeight(container.header);
-
-            container.headerHeight = parseInt(headerHeight, 10);
+            var headerHeight = container.headerHeight = parseInt(gridUtil.outerElementHeight(container.header), 10);
 
             if (oldHeaderHeight !== headerHeight) {
               rebuildStyles = true;
@@ -1886,9 +1884,7 @@ angular.module('ui.grid')
 
           if (container.headerCanvas) {
             var oldHeaderCanvasHeight = container.headerCanvasHeight;
-            var headerCanvasHeight = gridUtil.outerElementHeight(container.headerCanvas);
-
-            container.headerCanvasHeight = parseInt(headerCanvasHeight, 10);
+            var headerCanvasHeight = container.headerCanvasHeight = parseInt(gridUtil.outerElementHeight(container.headerCanvas), 10);
 
             if (oldHeaderCanvasHeight !== headerCanvasHeight) {
               rebuildStyles = true;