Attempt #3 at registry outage: ShellExecute reg delete

chrome/test/base/chrome_test_launcher.cc

Index: chrome/test/base/chrome_test_launcher.cc
diff --git a/chrome/test/base/chrome_test_launcher.cc b/chrome/test/base/chrome_test_launcher.cc
index 2b51be94a9121f41d34d4543e50d0237b6653c1b..3bd57a6a582b0343906ef5b14082b9c420317e92 100644
--- a/chrome/test/base/chrome_test_launcher.cc
+++ b/chrome/test/base/chrome_test_launcher.cc
@@ -16,6 +16,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/process/process_metrics.h"
 #include "base/run_loop.h"
+#include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/test/test_file_util.h"
 #include "build/build_config.h"
@@ -52,6 +53,7 @@
 #endif
 
 #if defined(OS_WIN)
+#include <shellapi.h>
 #include "base/win/registry.h"
 #include "chrome/app/chrome_crash_reporter_client_win.h"
 #include "chrome/install_static/install_util.h"
@@ -100,26 +102,37 @@ ChromeTestLauncherDelegate::CreateContentMainDelegate() {
 
 void ChromeTestLauncherDelegate::PreSharding() {
 #if defined(OS_WIN)
-  // Pre-test cleanup for registry state keyed off the profile dir (which can
-  // proliferate with the use of uniquely named scoped_dirs):
-  // https://crbug.com/721245. This needs to be here in order not to be racy
-  // with any tests that will access that state.
-  base::win::RegKey distrubution_key;
-  LONG result = distrubution_key.Open(HKEY_CURRENT_USER,
-                                      install_static::GetRegistryPath().c_str(),
-                                      KEY_SET_VALUE);
-
-  if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
-    LOG(ERROR) << "Failed to open distribution key for cleanup: " << result;
-    return;
-  }
-
-  result = distrubution_key.DeleteKey(L"PreferenceMACs");
-
-  if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
-    LOG(ERROR) << "Failed to cleanup PreferenceMACs: " << result;
-    return;
-  }
+  // Construct the distribution specific equivalent of
+  // "delete HKCU\\SOFTWARE\\Chromium\\PreferenceMACs /f".
+  base::string16 operation(L"delete HKCU\\");
+  operation.append(install_static::GetRegistryPath());
+  operation.append(L"\\PreferenceMACs /f");
+  // TODO(gab): This is a nuclear option while the cleanup below doesn't work as
+  // the bots are in such bad shape per https://crbug.com/721245 that doing any
+  // registry operations from C++ results in fatal error 1450 (insufficient
+  // resources). Hopefully ShellExecute works...
+  ::ShellExecute(NULL, NULL, L"reg.exe", operation.c_str(), NULL, 0);
+
+// // Pre-test cleanup for registry state keyed off the profile dir (which can
+// // proliferate with the use of uniquely named scoped_dirs):
+// // https://crbug.com/721245. This needs to be here in order not to be racy
+// // with any tests that will access that state.
+// base::win::RegKey distrubution_key;
+// LONG result = distrubution_key.Open(
+//     HKEY_CURRENT_USER, install_static::GetRegistryPath().c_str(),
+//     KEY_SET_VALUE);
+
+// if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
+//   LOG(ERROR) << "Failed to open distribution key for cleanup: " << result;
+//   return;
+// }
+
+// result = distrubution_key.DeleteKey(L"PreferenceMACs");
+
+// if (result != ERROR_SUCCESS && result != ERROR_FILE_NOT_FOUND) {
+//   LOG(ERROR) << "Failed to cleanup PreferenceMACs: " << result;
+//   return;
+// }
 #endif
 }