Update bots so they use iOS10 SDK

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

Index: ios/build/bots/chromium.mac/ios-simulator-swarming.json
diff --git a/ios/build/bots/chromium.mac/ios-simulator-swarming.json b/ios/build/bots/chromium.mac/ios-simulator-swarming.json
index 56f912129cb2afcab03418546aa8ac2bb9aaeb13..210aafe2730f5a78018c14093f0467a4e678ec8a 100644
--- a/ios/build/bots/chromium.mac/ios-simulator-swarming.json
+++ b/ios/build/bots/chromium.mac/ios-simulator-swarming.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",
@@ -31,7 +31,7 @@
   "compiler": "ninja",
   "additional_compile_targets": ["gn_all"],
   "configuration": "Debug",
-  "sdk": "iphonesimulator9.0",
+  "sdk": "iphonesimulator10.0",
   "tests": [
     {
       "include": "common_tests.json",