Convert iOS try bots to Xcode 5.1 instead of 5.1.1

They only have 5.1 installed

BUG=460930

Review URL: https://codereview.chromium.org/947273002

Cr-Commit-Position: refs/heads/master@{#317636}

ios/build/bots/tryserver.chromium.mac/ios_dbg_simulator.json

@@ -5,7 +5,7 @@
   "comments": [
     "Tests for 32-bit iOS 7.1 iPhone simulator."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "arm32"

ios/build/bots/tryserver.chromium.mac/ios_dbg_simulator_ng.json

@@ -5,7 +5,7 @@
   "comments": [
     "Tests for 32-bit iOS 7.1 iPhone simulator."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "arm32"

ios/build/bots/tryserver.chromium.mac/ios_dbg_simulator_ninja.json

@@ -5,7 +5,7 @@
   "comments": [
     "Tests for 32-bit iOS 7.1 iPhone simulator."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "arm32"

ios/build/bots/tryserver.chromium.mac/ios_dbg_simulator_ninja_ng.json

@@ -5,7 +5,7 @@
   "comments": [
     "Tests for 32-bit iOS 7.1 iPhone simulator."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "arm32"

ios/build/bots/tryserver.chromium.mac/ios_rel_device.json

@@ -5,7 +5,7 @@
   "comments": [
     "Builder for 32-bit devices."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "arm32"

ios/build/bots/tryserver.chromium.mac/ios_rel_device_ng.json

@@ -5,7 +5,7 @@
   "comments": [
     "Builder for 32-bit devices."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "target_subarch": "arm32"

ios/build/bots/tryserver.chromium.mac/ios_rel_device_ninja.json

@@ -5,7 +5,7 @@
   "comments": [
     "Builder for fat binaries using ninja."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "clang_xcode": "0",

ios/build/bots/tryserver.chromium.mac/ios_rel_device_ninja_ng.json

@@ -5,7 +5,7 @@
   "comments": [
     "Builder for fat binaries using ninja."
   ],
-  "xcode version": "5.1.1",
+  "xcode version": "5.1",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
     "clang_xcode": "0",