perfetto: don't try to kill mspdbsrv

As we are actually building using clang-cl.exe rather than cl.exe, we
don't actually startup this process so don't try and kill it.

Change-Id: Iac61374d9eceb8ebaf7773b97f66cf412b884c10
Bug: 177349647
diff --git a/infra/luci/recipe_modules/windows_sdk/api.py b/infra/luci/recipe_modules/windows_sdk/api.py
index 5bd1c8a..921f37a 100644
--- a/infra/luci/recipe_modules/windows_sdk/api.py
+++ b/infra/luci/recipe_modules/windows_sdk/api.py
@@ -39,16 +39,10 @@
       yield
       return
 
-    try:
-      with self.m.context(infra_steps=True):
-        sdk_dir = self._ensure_sdk()
-      with self.m.context(**self._sdk_env(sdk_dir)):
-        yield
-    finally:
-      # cl.exe automatically starts background mspdbsrv.exe daemon which
-      # needs to be manually stopped so Swarming can tidy up after itself.
-      self.m.step('taskkill mspdbsrv',
-                  ['taskkill.exe', '/f', '/t', '/im', 'mspdbsrv.exe'])
+    with self.m.context(infra_steps=True):
+      sdk_dir = self._ensure_sdk()
+    with self.m.context(**self._sdk_env(sdk_dir)):
+      yield
 
   def _ensure_sdk(self):
     """Ensures the Windows SDK CIPD package is installed.
diff --git a/infra/luci/recipe_modules/windows_sdk/examples/full.expected/win.json b/infra/luci/recipe_modules/windows_sdk/examples/full.expected/win.json
index f6c937f..b325275 100644
--- a/infra/luci/recipe_modules/windows_sdk/examples/full.expected/win.json
+++ b/infra/luci/recipe_modules/windows_sdk/examples/full.expected/win.json
@@ -93,16 +93,6 @@
     "name": "ninja"
   },
   {
-    "cmd": [
-      "taskkill.exe",
-      "/f",
-      "/t",
-      "/im",
-      "mspdbsrv.exe"
-    ],
-    "name": "taskkill mspdbsrv"
-  },
-  {
     "name": "$result"
   }
 ]
\ No newline at end of file
diff --git a/infra/luci/recipes/perfetto.expected/ci_win.json b/infra/luci/recipes/perfetto.expected/ci_win.json
index 1efd91e..ff77115 100644
--- a/infra/luci/recipes/perfetto.expected/ci_win.json
+++ b/infra/luci/recipes/perfetto.expected/ci_win.json
@@ -172,17 +172,6 @@
     "name": "ninja"
   },
   {
-    "cmd": [
-      "taskkill.exe",
-      "/f",
-      "/t",
-      "/im",
-      "mspdbsrv.exe"
-    ],
-    "cwd": "[CACHE]\\builder\\perfetto",
-    "name": "taskkill mspdbsrv"
-  },
-  {
     "name": "$result"
   }
 ]
\ No newline at end of file