refactor(ngMock): extract browserTrigger from ngScenario

`ngScenario` is deprecated, and we expect to remove it from the project in 1.6,
but we use the `browserTrigger` helper throughout our unit tests.

So in preparation for removing `ngScenario` we are relocating `browserTrigger`
to the `ngMock` folder.

Although many people are using browserTrigger in their own application testing
we are still not yet ready to make this a public API; so developers use
this helper at their own risk.

Closes #14718

BREAKING CHANGE

Although it is not a public API, many developers are using `browserTrigger`
in their own application testing. We have now moved this helper from
`ngScenario/browserTrigger.js` to `ngMock/browserTrigger.js`.

angularFiles.js

@@ -137,7 +137,8 @@ var angularFiles = {
       'src/ngSanitize/filter/linky.js'
     ],
     'ngMock': [
-      'src/ngMock/angular-mocks.js'
+      'src/ngMock/angular-mocks.js',
+      'src/ngMock/browserTrigger.js'
     ],
     'ngTouch': [
       'src/ngTouch/touch.js',
@@ -152,7 +153,6 @@ var angularFiles = {
 
   'angularScenario': [
     'src/ngScenario/Scenario.js',
-    'src/ngScenario/browserTrigger.js',
     'src/ngScenario/Application.js',
     'src/ngScenario/Describe.js',
     'src/ngScenario/Future.js',
@@ -211,7 +211,6 @@ var angularFiles = {
     'build/angular.js',
     '@angularSrcModules',
     'test/modules/no_bootstrap.js',
-    'src/ngScenario/browserTrigger.js',
     'test/helpers/*.js',
     'test/ngAnimate/*.js',
     'test/ngMessageFormat/*.js',

src/ngMock/.jshintrc

@@ -5,6 +5,11 @@
 
     "angular": false,
     "expect": false,
-    "jQuery": false
+    "jQuery": false,
+
+    "AnimationEvent": false,
+    "TransitionEvent": false,
+    "WebKitAnimationEvent": false,
+    "WebKitTransitionEvent": false
   }
 }

src/ngScenario/.jshintrc

@@ -13,10 +13,6 @@
     "_jQuery": false,
     "angularInit": false,
     "formatException": false,
-    "AnimationEvent": false,
-    "TransitionEvent": false,
-    "WebKitAnimationEvent": false,
-    "WebKitTransitionEvent": false,
     "$runner": false,
     "callerFile": false
   }