Recipes: make cwd default to slave_build

scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___stable_branch___debug.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___stable_branch___debug.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___stable_branch___debug.json b/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___stable_branch___debug.json
index 82c92d24be949c00a829d2be28707f908a73491a..c37ffb671edcd85ff8fe69bf84ba50cfa27d2120 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___stable_branch___debug.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___stable_branch___debug.json
@@ -24,6 +24,7 @@
       "--output_manifest",
       "--with_branch_heads"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -56,6 +57,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "target_arch=ia32 v8_enable_slow_dchecks=1 v8_optimized_debug=1 v8_target_arch=arm"
     },
@@ -67,6 +69,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -82,6 +85,7 @@
       "make",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {