Revert "Disable failing browsers in CI configuration"

This reverts commit 7e09d27f56.

browserstack-karma.js

@@ -31,13 +31,13 @@ module.exports = {
   },
 
   // Older mainstream
-  // BS_Chrome_49: {
-  //   base: 'BrowserStack',
-  //   browser: 'chrome',
-  //   browser_version: '49',
-  //   os: 'Windows',
-  //   os_version: '10',
-  // },
+  BS_Chrome_49: {
+    base: 'BrowserStack',
+    browser: 'chrome',
+    browser_version: '49',
+    os: 'Windows',
+    os_version: '10',
+  },
   BS_Firefox_52: {
     base: 'BrowserStack',
     browser: 'firefox',
@@ -45,13 +45,13 @@ module.exports = {
     os: 'Windows',
     os_version: '10',
   },
-  // BS_Safari_9: {
-  //   base: 'BrowserStack',
-  //   browser: 'safari',
-  //   browser_version: '9.1',
-  //   os: 'OS X',
-  //   os_version: 'El Capitan',
-  // },
+  BS_Safari_9: {
+    base: 'BrowserStack',
+    browser: 'safari',
+    browser_version: '9.1',
+    os: 'OS X',
+    os_version: 'El Capitan',
+  },
 
   // Misc
   BS_Android_4_4: {
@@ -62,15 +62,15 @@ module.exports = {
     os_version: '4.4',
     real_mobile: true,
   },
-  // BS_iphone_10: {
-  //   base: 'BrowserStack',
-  //   browser: 'Mobile Safari',
-  //   browser_version: null,
-  //   device: 'iPhone 7',
-  //   real_mobile: true,
-  //   os: 'ios',
-  //   os_version: '10.3',
-  // },
+  BS_iphone_10: {
+    base: 'BrowserStack',
+    browser: 'Mobile Safari',
+    browser_version: null,
+    device: 'iPhone 7',
+    real_mobile: true,
+    os: 'ios',
+    os_version: '10.3',
+  },
   BS_MS_Edge: {
     base: 'BrowserStack',
     browser: 'edge',
@@ -78,18 +78,18 @@ module.exports = {
     os: 'Windows',
     os_version: '10',
   },
-  // BS_IE_11: {
-  //   base: 'BrowserStack',
-  //   browser: 'ie',
-  //   browser_version: '11.0',
-  //   os: 'Windows',
-  //   os_version: '7',
-  // },
-  // BS_IE_10: {
-  //   base: 'BrowserStack',
-  //   browser: 'ie',
-  //   browser_version: '10.0',
-  //   os: 'Windows',
-  //   os_version: '7',
-  // },
+  BS_IE_11: {
+    base: 'BrowserStack',
+    browser: 'ie',
+    browser_version: '11.0',
+    os: 'Windows',
+    os_version: '7',
+  },
+  BS_IE_10: {
+    base: 'BrowserStack',
+    browser: 'ie',
+    browser_version: '10.0',
+    os: 'Windows',
+    os_version: '7',
+  },
 };