Recipes: make cwd default to slave_build

scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___nosnap___shared.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___nosnap___shared.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___nosnap___shared.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___nosnap___shared.json
index 7e7c5697a38419e4996b26096088afa8e875c402..6005ef81bb942f849fd01b22381519c3cacec1f0 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___nosnap___shared.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Win32___nosnap___shared.json
@@ -5,6 +5,7 @@
       "-u",
       "[BUILD]\\scripts\\slave\\kill_processes.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "taskkill"
   },
   {
@@ -31,6 +32,7 @@
       "--no_shallow",
       "--output_manifest"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -63,6 +65,7 @@
       "[DEPOT_TOOLS]\\gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "component=shared_library target_arch=ia32 v8_target_arch=ia32 v8_use_snapshot=false",
       "GYP_MSVS_VERSION": "2013"
@@ -75,6 +78,7 @@
       "-u",
       "[BUILD]\\scripts\\slave\\cleanup_temp.py"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
@@ -90,6 +94,7 @@
       "vs",
       "--"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "compile"
   },
   {