Update bots so they use iOS10 SDK

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

Index: ios/build/bots/chromium.mac/ios-simulator.json
diff --git a/ios/build/bots/chromium.mac/ios-simulator.json b/ios/build/bots/chromium.mac/ios-simulator.json
index ca344a92d4c215d977c4d4ce8f6e27286f91eb07..02fe56887dea7b1061056413083f56cd1425a3ea 100644
--- a/ios/build/bots/chromium.mac/ios-simulator.json
+++ b/ios/build/bots/chromium.mac/ios-simulator.json
@@ -8,7 +8,7 @@
     "Tests run on iPhone 5s (64-bit) and iPad Retina (32-bit).",
     "Build is performed with gn+ninja."
   ],
-  "xcode version": "7.0",
+  "xcode version": "8.0",
   "GYP_DEFINES": [
     "OS=ios",
     "chromium_ios_signing=0",
@@ -30,7 +30,7 @@
   "mb_type": "gn",
   "compiler": "ninja",
   "configuration": "Debug",
-  "sdk": "iphonesimulator9.0",
+  "sdk": "iphonesimulator10.0",
   "tests": [
     {
       "include": "common_tests.json",