Re-enable ProcessPriorityAfterStoppedAudio test on Windows.

chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc

Index: chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
diff --git a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
index cd0a3eb84f19204e0c90c6f9472a398eb01ff92f..08c940679f9e1e135e8762ba031286c5b057c133 100644
--- a/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
+++ b/chrome/browser/renderer_host/render_process_host_chrome_browsertest.cc
@@ -593,15 +593,8 @@ class ChromeRenderProcessHostBackgroundingTest
 
 // Test to make sure that a process is backgrounded when the audio stops playing
 // from the active tab and there is an immediate tab switch.
-// Disable on Windows due to ongoing flakiness. (crbug.com/616421)
-#if defined(OS_WIN)
-#define MAYBE_ProcessPriorityAfterStoppedAudio \
-  DISABLED_ProcessPriorityAfterStoppedAudio
-#else
-#define MAYBE_ProcessPriorityAfterStoppedAudio ProcessPriorityAfterStoppedAudio
-#endif
 IN_PROC_BROWSER_TEST_F(ChromeRenderProcessHostBackgroundingTest,
-                       MAYBE_ProcessPriorityAfterStoppedAudio) {
+                       ProcessPriorityAfterStoppedAudio) {
   // This test is invalid on platforms that can't background.
   if (!base::Process::CanBackgroundProcesses())
     return;