Add config for ios-simulator-cronet bot

ios/build/bots/chromium.mac/ios-simulator-cronet.json

 {
   "owners": [
     "smut"
   ],
   "comments": [
-    "Tests for 32- and 64-bit iOS 9.0 simulators.",
+    "Cronet tests for 32- and 64-bit iOS 9.0 simulators.",
     "Tests run on iPhone 5s (64-bit) and iPad Retina (32-bit)."
   ],
   "xcode version": "7.0",
   "GYP_DEFINES": [
     "OS=ios",
     "chromium_ios_signing=0",
     "component=static_library",
+    "enable_websockets=false",
+    "disable_brotli_filter=true",
+    "disable_file_support=true",
+    "disable_ftp_support=true",
+    "gomadir=$(goma_dir)",
+    "target_subarch=both",
     "use_goma=1",
-    "gomadir=$(goma_dir)",
-    "target_subarch=both"
+    "use_platform_icu_alternatives=true"
   ],
   "mb_type": "gyp",
   "compiler": "ninja",
   "configuration": "Debug",
   "sdk": "iphonesimulator9.0",
   "tests": [
     {
-      "include": "common_tests.json",
+      "app": "cronet_test",
       "device type": "iPhone 5s",
       "os": "9.0"
     },
     {
-      "include": "common_tests.json",
+      "app": "cronet_test",
       "device type": "iPad Retina",
       "os": "9.0"
     }
   ]
 }