Make blink_trybot recipe work on windows

scripts/slave/recipes/android_webview_aosp.expected/works_if_revision_not_present.json

Index: scripts/slave/recipes/android_webview_aosp.expected/works_if_revision_not_present.json
diff --git a/scripts/slave/recipes/android_webview_aosp.expected/works_if_revision_not_present.json b/scripts/slave/recipes/android_webview_aosp.expected/works_if_revision_not_present.json
index 72c5556624de1f9a16f758b49cfd5e0789a1041e..d24a1f65d82b69401d7c7344a3ef8abf45cfc65a 100644
--- a/scripts/slave/recipes/android_webview_aosp.expected/works_if_revision_not_present.json
+++ b/scripts/slave/recipes/android_webview_aosp.expected/works_if_revision_not_present.json
@@ -1,15 +1,15 @@
 [
   {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "config", "--spec", "deps_os = {}\nhooks = []\nsolutions = [{'custom_deps': {}, 'custom_vars': {}, 'deps_file': '', 'managed': True, 'name': 'src', 'safesync_url': None, 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]\ntarget_os = []\ntarget_os_only = False"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/gclient.py", "config", "--spec", "deps_os = {}\nhooks = []\nsolutions = [{'custom_deps': {}, 'custom_vars': {}, 'deps_file': '', 'managed': True, 'name': 'src', 'safesync_url': None, 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]\ntarget_os = []\ntarget_os_only = False"],
    "name": "[spec: empty_deps] gclient setup",
    "seed_steps": ["[spec: empty_deps] gclient setup", "[spec: empty_deps] gclient revert", "[spec: empty_deps] gclient sync"]
   },
   {
-   "cmd": ["python", "[BUILD_ROOT]/scripts/slave/gclient_safe_revert.py", ".", "[DEPOT_TOOLS_ROOT]/gclient"],
+   "cmd": ["python", "-u", "[BUILD_ROOT]/scripts/slave/gclient_safe_revert.py", ".", "[DEPOT_TOOLS_ROOT]/gclient"],
    "name": "[spec: empty_deps] gclient revert"
   },
   {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "sync", "--nohooks"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/gclient.py", "sync", "--nohooks"],
    "name": "[spec: empty_deps] gclient sync"
   },
   {
@@ -17,16 +17,16 @@
    "name": "calculate trimmed deps"
   },
   {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "config", "--spec", "deps_os = {}\nhooks = []\nsolutions = [{'custom_deps': {'src/blacklist/project/1': None, 'src/blacklist/project/2': None}, 'custom_vars': {}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'safesync_url': None, 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]\ntarget_os = ['android']\ntarget_os_only = False"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/gclient.py", "config", "--spec", "deps_os = {}\nhooks = []\nsolutions = [{'custom_deps': {'src/blacklist/project/1': None, 'src/blacklist/project/2': None}, 'custom_vars': {}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'safesync_url': None, 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]\ntarget_os = ['android']\ntarget_os_only = False"],
    "name": "[spec: trimmed] gclient setup",
    "seed_steps": ["[spec: trimmed] gclient setup", "[spec: trimmed] gclient revert", "[spec: trimmed] gclient sync"]
   },
   {
-   "cmd": ["python", "[BUILD_ROOT]/scripts/slave/gclient_safe_revert.py", ".", "[DEPOT_TOOLS_ROOT]/gclient"],
+   "cmd": ["python", "-u", "[BUILD_ROOT]/scripts/slave/gclient_safe_revert.py", ".", "[DEPOT_TOOLS_ROOT]/gclient"],
    "name": "[spec: trimmed] gclient revert"
   },
   {
-   "cmd": ["[DEPOT_TOOLS_ROOT]/gclient", "sync", "--nohooks"],
+   "cmd": ["python", "-u", "[DEPOT_TOOLS_ROOT]/gclient.py", "sync", "--nohooks"],
    "name": "[spec: trimmed] gclient sync"
   },
   {