Fix http://crbug.com/87176, and write a browsertest for it.

content/browser/renderer_host/render_view_host_browsertest.cc

Index: content/browser/renderer_host/render_view_host_browsertest.cc
diff --git a/content/browser/renderer_host/render_view_host_browsertest.cc b/content/browser/renderer_host/render_view_host_browsertest.cc
index 0bd8f1e3b299c568f109671b0eec891102abd9c3..03de840a8f8b8fe22e9ca3a8b5c6ac1a1da4177f 100644
--- a/content/browser/renderer_host/render_view_host_browsertest.cc
+++ b/content/browser/renderer_host/render_view_host_browsertest.cc
@@ -8,11 +8,13 @@
 #include "base/values.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
+#include "content/common/child_process_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/content_paths.h"
 #include "content/public/test/browser_test_utils.h"
+#include "content/public/test/test_notification_tracker.h"
 #include "content/shell/shell.h"
 #include "content/test/content_browser_test.h"
 #include "content/test/content_browser_test_utils.h"
@@ -115,4 +117,28 @@ IN_PROC_BROWSER_TEST_F(RenderViewHostTest, BasicRenderFrameHost) {
             new_rvh->main_render_frame_host_->routing_id());
 }
 
+IN_PROC_BROWSER_TEST_F(RenderViewHostTest,
+                       ShutdownRequestFromActiveTabIgnored) {
+  ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
+
+  GURL test_url = embedded_test_server()->GetURL("/simple_page.html");
+  NavigateToURL(shell(), test_url);
+  RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
+      shell()->web_contents()->GetRenderViewHost());
+  RenderProcessHost* rph = rvh->GetProcess();
+
+  TestNotificationTracker termination_watcher;
+  termination_watcher.ListenFor(NOTIFICATION_RENDERER_PROCESS_CLOSED,
+                                Source<RenderProcessHost>(rph));
+  ChildProcessHostMsg_ShutdownRequest msg;
+  rvh->GetProcess()->OnMessageReceived(msg);
+
+  // If the RPH sends a mistaken ChildProcessMsg_Shutdown, the renderer process
+  // will take some time to die. Wait for a second tab to load in order to give
+  // that time to happen.
+  NavigateToURL(CreateBrowser(), test_url);
+
+  EXPECT_EQ(0U, termination_watcher.size());
+}
+
 }  // namespace content