Added ability to set ChromeDownloadManagerDelegate for testing.

chrome/browser/profiles/off_the_record_profile_impl.cc

Index: chrome/browser/profiles/off_the_record_profile_impl.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_impl.cc b/chrome/browser/profiles/off_the_record_profile_impl.cc
index 964bc8b090308dc6bb802fac60a4fa48a403528d..0dba6ec17bb298e0d81170ff53fcae17b407c6dc 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl.cc
+++ b/chrome/browser/profiles/off_the_record_profile_impl.cc
@@ -316,7 +316,10 @@ class OffTheRecordProfileImpl : public Profile,
 
   virtual DownloadManager* GetDownloadManager() {
     if (!download_manager_.get()) {
-      download_manager_delegate_ = new ChromeDownloadManagerDelegate(this);
+      // In case the delegate has already been set by
+      // SetDownloadManagerDelegate.
+      if (!download_manager_delegate_.get())
+        download_manager_delegate_ = new ChromeDownloadManagerDelegate(this);
       scoped_refptr<DownloadManager> dlm(
           new DownloadManager(download_manager_delegate_,
                               g_browser_process->download_status_updater()));
@@ -580,6 +583,11 @@ class OffTheRecordProfileImpl : public Profile,
   }
 
  private:
+  virtual void SetDownloadManagerDelegate(
+      ChromeDownloadManagerDelegate* delegate) {
+    download_manager_delegate_ = delegate;
+  }
+
   void CreateQuotaManagerAndClients() {
     if (quota_manager_.get()) {
       DCHECK(file_system_context_.get());