test(toolbar): Fix failing unit tests in 1.3.x.

In Angular 1.3.20/19, some of the toolbar unit tests fail due to
not properly calling `$timeout.flush()` within the test.

Add the proper timeout flush to the tests.

  Closes #6550

src/components/toolbar/toolbar.spec.js

@@ -118,7 +118,7 @@ describe('<md-toolbar>', function() {
  expect(element.find('md-toolbar').length).toBe(0);
  }));
 
- it('works with ng-show', inject(function($$rAF) {
+ it('works with ng-show', inject(function($$rAF, $timeout) {
  var template =
  '<div layout="column" style="height: 600px;">' +
  ' <md-toolbar md-scroll-shrink="true" ng-show="shouldShowToolbar">test</md-toolbar>' +
@@ -154,6 +154,7 @@ describe('<md-toolbar>', function() {
  // Show the toolbar and ensure it is visible
  pageScope.$apply('shouldShowToolbar = true');
  pageScope.$digest();
+ $timeout.flush();
 
  toolbarStyles = getComputedStyle(element.find('md-toolbar')[0]);
  contentStyles = getComputedStyle(element.find('md-content')[0]);
@@ -170,7 +171,7 @@ describe('<md-toolbar>', function() {
  document.body.removeChild(element[0]);
  }));
 
- it('works with ng-hide', inject(function($$rAF) {
+ it('works with ng-hide', inject(function($$rAF, $timeout) {
  var template =
  '<div layout="column" style="height: 600px;">' +
  ' <md-toolbar md-scroll-shrink="true" ng-hide="shouldNotShowToolbar">test</md-toolbar>' +
@@ -206,6 +207,7 @@ describe('<md-toolbar>', function() {
  // Show the toolbar and ensure it is hidden
  pageScope.$apply('shouldNotShowToolbar = true');
  pageScope.$digest();
+ $timeout.flush();
 
  toolbarStyles = getComputedStyle(element.find('md-toolbar')[0]);
  contentStyles = getComputedStyle(element.find('md-content')[0]);