Update upstream bots to target iOS SDK 9.0.

ios/build/bots/chromium.mac/iOS_Simulator_(dbg).json

 {
   "owners": [
     "smut"
   ],
   "comments": [
-    "Tests for 32- and 64-bit iOS 8.3 simulators."
+    "Tests for 32- and 64-bit iOS 9.0 simulators."
   ],
-  "xcode version": "6.3",
+  "xcode version": "7.0",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "both"
   },
   "compiler": "xcodebuild",
   "configuration": "Debug",
-  "sdk": "iphonesimulator8.3",
+  "sdk": "iphonesimulator9.0",
   "tests": [
     {
       "include": "common_tests.json",
       "device type": "iPhone 5s",
+      "os": "9.0"
+    },
+    {
+      "include": "common_tests.json",
+      "device type": "iPad Retina",
+      "os": "9.0"
+    },
+    {
+      "include": "common_tests.json",
+      "device type": "iPhone 5s",
       "os": "8.3"
     },
     {
       "include": "common_tests.json",
       "device type": "iPad Retina",
       "os": "8.3"
     },
     {
       "include": "common_tests.json",
       "device type": "iPhone 5s",
       "os": "7.1"
     },
     {
       "include": "common_tests.json",
       "device type": "iPad Retina",
       "os": "7.1"
     }
   ]
 }