Modified cancel and interrupt processing to avoid race with history.

chrome/browser/download/download_request_handle.cc

Index: chrome/browser/download/download_request_handle.cc
diff --git a/chrome/browser/download/download_request_handle.cc b/chrome/browser/download/download_request_handle.cc
index 9e7f581f30fcfd7592093afda408fd51b883777a..1ad5a740b802cd54e9948080915a1a845a308ed1 100644
--- a/chrome/browser/download/download_request_handle.cc
+++ b/chrome/browser/download/download_request_handle.cc
@@ -68,7 +68,7 @@ DownloadManager* DownloadRequestHandle::GetDownloadManager() const {
   return profile->GetDownloadManager();
 }
 
-void DownloadRequestHandle::PauseRequest() {
+void DownloadRequestHandle::PauseRequest() const {
   // The post is safe because ResourceDispatcherHost is guaranteed
   // to outlive the IO thread.
   if (rdh_) {
@@ -79,7 +79,7 @@ void DownloadRequestHandle::PauseRequest() {
   }
 }
 
-void DownloadRequestHandle::ResumeRequest() {
+void DownloadRequestHandle::ResumeRequest() const {
   // The post is safe because ResourceDispatcherHost is guaranteed
   // to outlive the IO thread.
   if (rdh_) {
@@ -90,7 +90,7 @@ void DownloadRequestHandle::ResumeRequest() {
   }
 }
 
-void DownloadRequestHandle::CancelRequest() {
+void DownloadRequestHandle::CancelRequest() const {
   // The post is safe because ResourceDispatcherHost is guaranteed
   // to outlive the IO thread.
   if (rdh_) {