Revert "Win Native Notifications: Fix window activation."

This reverts commit 933cf169.

Reason for revert: Handle leak causing test failures.

Original change's description:
> Win Native Notifications: Fix window activation.
> 
> This fixes the issue with window activation not functioning correctly
> when notifications are activated while Chrome is running but in the
> background.
> 
> Bug: 837796, 734095
> Change-Id: I8eac14403850a13d60e7a50c3c795fed96205d7e
> Reviewed-on: https://chromium-review.googlesource.com/1049984
> Reviewed-by: Greg Thompson <grt@chromium.org>
> Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#556955}

TBR=finnur@chromium.org,grt@chromium.org

Change-Id: Ib0e0d132867555f822dc13061b63bca123c16df9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 837796, 734095
Reviewed-on: https://chromium-review.googlesource.com/1051385Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557125}

chrome/notification_helper/notification_activator.cc

@@ -77,8 +77,7 @@ HRESULT NotificationActivator::Activate(
   SHELLEXECUTEINFO info;
   memset(&info, 0, sizeof(info));
   info.cbSize = sizeof(info);
-  info.fMask =
-      SEE_MASK_NOASYNC | SEE_MASK_FLAG_LOG_USAGE | SEE_MASK_NOCLOSEPROCESS;
+  info.fMask = SEE_MASK_NOASYNC | SEE_MASK_FLAG_LOG_USAGE;
   info.lpFile = chrome_exe_path.value().c_str();
   info.lpParameters = params.c_str();
   info.nShow = SW_SHOWNORMAL;
@@ -89,18 +88,6 @@ HRESULT NotificationActivator::Activate(
     return HRESULT_FROM_WIN32(error_code);
   }
 
-  if (info.hProcess != NULL) {
-    DWORD pid = ::GetProcessId(info.hProcess);
-    if (!::AllowSetForegroundWindow(pid)) {
-      DWORD error_code = ::GetLastError();
-      Trace(L"Unable to forward activation privilege; error: 0x%08X\n",
-            error_code);
-      return HRESULT_FROM_WIN32(error_code);
-    }
-
-    CloseHandle(info.hProcess);
-  }
-
   return S_OK;
 }