Recipes: make cwd default to slave_build

scripts/slave/recipes/chromium.expected/full_chromium_fyi_Chromium_iOS_Device.json

Index: scripts/slave/recipes/chromium.expected/full_chromium_fyi_Chromium_iOS_Device.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Chromium_iOS_Device.json b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Chromium_iOS_Device.json
index 26eb9b3a13d6200d360e82dc8c81e4ab1b553193..8dbbee7596bac18077df0347baec88a4e6a192c4 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Chromium_iOS_Device.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_fyi_Chromium_iOS_Device.json
@@ -21,6 +21,7 @@
       "--revision",
       "src@HEAD"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -67,6 +68,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_CROSSCOMPILE": "1",
       "GYP_DEFINES": "OS=ios chromium_ios_signing=0 component=static_library",
@@ -82,6 +84,7 @@
       "[SLAVE_BUILD]/src/testing/buildbot/chromium.fyi.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read test spec",
     "~followup_annotations": [
       "@@@STEP_TEXT@path: [SLAVE_BUILD]/src/testing/buildbot/chromium.fyi.json@@@",
@@ -104,6 +107,7 @@
       "--properties",
       "{\"buildername\": \"Chromium iOS Device\", \"buildnumber\": 571, \"mastername\": \"chromium.fyi\", \"slavename\": \"TestSlavename\", \"target_platform\": \"ios\"}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
@@ -116,6 +120,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -135,6 +140,7 @@
       "-sdk",
       "iphoneos7.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   }
 ]