Reland of Check that all shared workers are terminated.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 309e4eb4e5e5b5e14bfe5361916cab4e875f1020..5f429fd120f472eba673db2370fcce2cad3bb0b7 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -1103,6 +1103,12 @@
       case BrowserThread::IO: {
         TRACE_EVENT0("shutdown", "BrowserMainLoop::Subsystem:IOThread");
         ResetThread_IO(std::move(io_thread_));
+
+        // TODO(alokp): Remove after collecting crash data.
+        // Temporary checks to verify that all shared workers are terminated.
+        // It is suspected that shared workers prevent render process hosts
+        // from shutting down: crbug.com/608049
+        RenderProcessHostImpl::CheckAllWorkersTerminated();
         break;
       }
       case BrowserThread::UI: