Ignore kill termination status when shutting down a child process.

content/public/common/child_process_host.h

Index: content/public/common/child_process_host.h
diff --git a/content/public/common/child_process_host.h b/content/public/common/child_process_host.h
index 7fbac4c8f6f9b259f7a14eb1043c4c0a1cb1e49d..1d2f56890d4acf6b01ca5f773ed1e9c104d55f10 100644
--- a/content/public/common/child_process_host.h
+++ b/content/public/common/child_process_host.h
@@ -77,6 +77,9 @@ class CONTENT_EXPORT ChildProcessHost : public IPC::Sender {
   // Does not check with the delegate's CanShutdown.
   virtual void ForceShutdown() = 0;
 
+  // Returns true if a shutdown message has been sent to the child process.
+  virtual bool IsShuttingDown() = 0;
+
   // Creates the IPC channel.  Returns the channel id if it succeeded, an
   // empty string otherwise
   virtual std::string CreateChannel() = 0;