build: remove required BrowserStack run as it fails with “Access denied” (angular#19769)

See angular#19768
PR Close angular#19769

Author: tbosch

.travis.yml

@@ -50,7 +50,8 @@ env:
     - CI_MODE=e2e_2
     - CI_MODE=js
     - CI_MODE=saucelabs_required
-    - CI_MODE=browserstack_required
+    # deactivated, see #19768
+    # - CI_MODE=browserstack_required
     - CI_MODE=saucelabs_optional
     - CI_MODE=browserstack_optional
     - CI_MODE=aio_tools_test

browser-providers.conf.js

@@ -32,7 +32,7 @@ var CIconfiguration = {
   'Safari8': {unitTest: {target: 'BS', required: false}, e2e: {target: null, required: true}},
   'Safari9': {unitTest: {target: 'BS', required: false}, e2e: {target: null, required: true}},
   'Safari10': {unitTest: {target: 'BS', required: false}, e2e: {target: null, required: true}},
-  'iOS7': {unitTest: {target: 'BS', required: false}, e2e: {target: null, required: true}},
+  'iOS7': {unitTest: {target: 'BS', required: true}, e2e: {target: null, required: true}},
   'iOS8': {unitTest: {target: 'BS', required: false}, e2e: {target: null, required: true}},
   'iOS9': {unitTest: {target: 'BS', required: false}, e2e: {target: null, required: true}},
   'iOS10': {unitTest: {target: 'SL', required: false}, e2e: {target: null, required: true}},