Recipes: make cwd default to slave_build

scripts/slave/recipes/ios/unified_builder_tester.expected/multiple_failures.json

Index: scripts/slave/recipes/ios/unified_builder_tester.expected/multiple_failures.json
diff --git a/scripts/slave/recipes/ios/unified_builder_tester.expected/multiple_failures.json b/scripts/slave/recipes/ios/unified_builder_tester.expected/multiple_failures.json
index c41ad66f14c091dda259a09b3cc8a7f348600a6b..f77d509931e950fb08cbd9dd69aeb7e52d36b7a9 100644
--- a/scripts/slave/recipes/ios/unified_builder_tester.expected/multiple_failures.json
+++ b/scripts/slave/recipes/ios/unified_builder_tester.expected/multiple_failures.json
@@ -5,6 +5,7 @@
       "--json-file",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "host and tools info",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br />OS X 1.2.3, Xcode 6.7.8 (5D342509a)@@@",
@@ -44,6 +45,7 @@
       "src@HEAD",
       "--force"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "bot_update",
     "~followup_annotations": [
       "@@@STEP_TEXT@Some step text@@@",
@@ -91,6 +93,7 @@
       "[SLAVE_BUILD]/src/ios/build/bots/chromium.fake/ios.json",
       "/path/to/tmp/json"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "read build config",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -144,6 +147,7 @@
       "-e",
       "{\n  \"GYP_DEFINES\": {\n    \"OS\": \"ios\", \n    \"component\": \"static_library\", \n    \"fake gyp define 1\": \"fake value 1\", \n    \"fake gyp define 2\": \"fake value 2\"\n  }, \n  \"compiler\": \"xcodebuild\", \n  \"configuration\": \"Debug\", \n  \"sdk\": \"iphonesimulator7.1\", \n  \"tests\": [\n    {\n      \"app\": \"fake tests 1\", \n      \"device type\": \"fake device\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake tests 2\", \n      \"device type\": \"fake device\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake tests 3\", \n      \"device type\": \"fake device\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake tests 4\", \n      \"device type\": \"fake device\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake tests 5\", \n      \"device type\": \"fake device\", \n      \"os\": \"8.1\"\n    }, \n    {\n      \"app\": \"fake tests 6\", \n      \"device type\": \"fake device\", \n      \"os\": \"8.1\"\n    }\n  ], \n  \"triggered bots\": {}, \n  \"xcode version\": \"fake xcode version\"\n}"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "finalize build config"
   },
   {
@@ -154,6 +158,7 @@
       "--version",
       "fake xcode version"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "find xcode",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
@@ -167,6 +172,7 @@
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "env": {
       "GYP_DEFINES": "fake gyp define 1=fake value 1 fake gyp define 2=fake value 2 component=static_library OS=ios",
       "GYP_GENERATORS": "xcode",
@@ -205,6 +211,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake tests 1 (fake device iOS 8.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -239,6 +246,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake tests 2 (fake device iOS 8.1)",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
@@ -275,6 +283,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake tests 3 (fake device iOS 8.1)",
     "~followup_annotations": [
       "step returned non-zero exit code: 1",
@@ -311,6 +320,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake tests 4 (fake device iOS 8.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
@@ -345,6 +355,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake tests 5 (fake device iOS 8.1)",
     "~followup_annotations": [
       "step returned non-zero exit code: 2",
@@ -381,6 +392,7 @@
       "--version",
       "8.1"
     ],
+    "cwd": "[SLAVE_BUILD]",
     "name": "fake tests 6 (fake device iOS 8.1)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",