Use ForceShutdown to kill old GPU process.

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index 9f0d735349431b424ceae1dceb838b18e2f2e8d2..a0ec30750f28972a5e8e67b3a53c72001cd1cd8c 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -184,8 +184,7 @@ static bool HostIsValid(int host_id, GpuProcessHost* host) {
     return true;
   }
 
-  host->Send(new GpuMsg_Crash());
-  g_hosts_by_id.Pointer()->Remove(host_id);
+  host->ForceShutdown();
   return false;
 }
 
@@ -544,6 +543,11 @@ bool GpuProcessHost::software_rendering() {
   return software_rendering_;
 }
 
+void GpuProcessHost::ForceShutdown() {
+  g_hosts_by_id.Pointer()->Remove(host_id_);
+  BrowserChildProcessHost::ForceShutdown();
+}
+
 bool GpuProcessHost::LaunchGpuProcess(const std::string& channel_id) {
   if (!gpu_enabled_ || g_gpu_crash_count >= kGpuMaxCrashCount) {
     SendOutstandingReplies();