Recipes: make cwd default to slave_build

scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___roll_branch.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___roll_branch.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___roll_branch.json b/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___roll_branch.json
index 148fcbecc5763219e6abe9e3ef228ac494e8dd01..aed52eb829cec8b96daef4717fb04e37d9eae860 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___roll_branch.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_branches_V8_arm___sim___roll_branch.json
@@ -23,6 +23,7 @@
       "--no_shallow",
       "--output_manifest"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -55,6 +56,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "target_arch=ia32 v8_target_arch=arm"
     },
@@ -66,6 +68,7 @@
       "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -81,6 +84,7 @@
       "make",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {