Upgraded browsers for Trusty servers

Firefox: 45.0.2
Chrome: 59.0.3071.115

LEARNER-509

playbooks/roles/browsers/defaults/main.yml

@@ -32,10 +32,10 @@ browser_s3_deb_pkgs:
     url: https://s3.amazonaws.com/vagrant.testeng.edx.org/google-chrome-stable_55.0.2883.87-1_amd64.deb
 
 trusty_browser_s3_deb_pkgs:
-  - name: google-chrome-stable_30.0.1599.114-1_amd64.deb
-    url: https://s3.amazonaws.com/vagrant.testeng.edx.org/google-chrome-stable_30.0.1599.114-1_amd64.deb
-  - name: firefox-mozilla-build_42.0-0ubuntu1_amd64.deb
-    url: https://s3.amazonaws.com/vagrant.testeng.edx.org/firefox-mozilla-build_42.0-0ubuntu1_amd64.deb
+  - name: firefox_45.0.2+build1-0ubuntu1_amd64
+    url: https://s3.amazonaws.com/vagrant.testeng.edx.org/firefox_45.0.2%2Bbuild1-0ubuntu1_amd64.deb
+  - name: google-chrome-stable_59.0.3071.115-1_amd64.deb
+    url: https://s3.amazonaws.com/vagrant.testeng.edx.org/google-chrome-stable_59.0.3071.115-1_amd64.deb
 
 # ChromeDriver
 chromedriver_version: 2.27