fix(tooltip): move document.contains polyfill for IE11 into $mdUtil (#11749)

when `$mdGestureProvider.disableAll()` was called
- the polyfill wasn't being registered
- this cause hovering over a tooltip to throw
now we always register it when $mdUtil loads

Fixes #11745

Author: Splaktar

src/core/services/compiler/compiler.js

@@ -506,7 +506,6 @@ function MdCompilerProvider($compileProvider) {
    * @returns {{element: !JQLite, restore: !function}}
    */
   MdCompilerService.prototype._fetchContentElement = function(options) {
-
     var contentEl = options.contentElement;
     var restoreFn = null;
 

src/core/services/gesture/gesture.js

@@ -577,12 +577,6 @@ function attachToDocument($mdGesture, $$MdGestureHandler) {
     return;
   }
 
-  // Polyfill document.contains for IE11.
-  // TODO: move to util
-  document.contains || (document.contains = function (node) {
-    return document.body.contains(node);
-  });
-
   if (!isInitialized && $mdGesture.isHijackingClicks) {
     /*
      * If hijack clicks is true, we preventDefault any click that wasn't

src/core/util/util.js

@@ -19,12 +19,18 @@ angular
 /**
  * @ngInject
  */
-function UtilFactory($document, $timeout, $compile, $rootScope, $$mdAnimate, $interpolate, $log, $rootElement, $window, $$rAF) {
+function UtilFactory($document, $timeout, $compile, $rootScope, $$mdAnimate, $interpolate, $log,
+                     $rootElement, $window, $$rAF) {
   // Setup some core variables for the processTemplate method
   var startSymbol = $interpolate.startSymbol(),
     endSymbol = $interpolate.endSymbol(),
     usesStandardSymbols = ((startSymbol === '{{') && (endSymbol === '}}'));
 
+  // Polyfill document.contains for IE11.
+  document.contains || (document.contains = function (node) {
+    return document.body.contains(node);
+  });
+
   /**
    * Checks if the target element has the requested style by key
    * @param {DOMElement|JQLite} target Target element
@@ -37,14 +43,15 @@ function UtilFactory($document, $timeout, $compile, $rootScope, $$mdAnimate, $in
 
     if (target && target.length) {
       var computedStyles = $window.getComputedStyle(target[0]);
-      hasValue = angular.isDefined(computedStyles[key]) && (expectedVal ? computedStyles[key] == expectedVal : true);
+      hasValue = angular.isDefined(computedStyles[key]) &&
+        (expectedVal ? computedStyles[key] == expectedVal : true);
     }
 
     return hasValue;
   };
 
   function validateCssValue(value) {
-    return !value       ? '0'   :
+    return !value ? '0' :
       hasPx(value) || hasPercent(value) ? value : value + 'px';
   }
 
@@ -54,7 +61,6 @@ function UtilFactory($document, $timeout, $compile, $rootScope, $$mdAnimate, $in
 
   function hasPercent(value) {
     return String(value).indexOf('%') > -1;
-
   }
 
   var $mdUtil = {