Remove keep-alive impulse IPCs from NaCl modules.

components/nacl/browser/nacl_browser_delegate.h

Index: components/nacl/browser/nacl_browser_delegate.h
diff --git a/components/nacl/browser/nacl_browser_delegate.h b/components/nacl/browser/nacl_browser_delegate.h
index 45c93b5676608d62e3ad7e901b01982946ab841d..9d73cf0962c17b4d59e55d078e0d42a7358e060a 100644
--- a/components/nacl/browser/nacl_browser_delegate.h
+++ b/components/nacl/browser/nacl_browser_delegate.h
@@ -73,10 +73,6 @@ class NaClBrowserDelegate {
   // Returns whether NaCl application with this manifest URL should be debugged.
   virtual bool URLMatchesDebugPatterns(const GURL& manifest_url) = 0;
 
-  // Returns a callback that handles NaCl idle state transitions.
-  virtual content::BrowserPpapiHost::OnKeepaliveCallback
-      GetOnKeepaliveCallback() = 0;
-
   // Returns whether Non-SFI mode is allowed for a given manifest URL.
   virtual bool IsNonSfiModeAllowed(const base::FilePath& profile_directory,
                                    const GURL& manifest_url) = 0;