Move download stuff to download tab helper.

chrome/browser/ui/download/download_tab_helper.h

Index: chrome/browser/ui/download/download_tab_helper.h
diff --git a/chrome/browser/ui/download/download_tab_helper.h b/chrome/browser/ui/download/download_tab_helper.h
index 24ab7fc75c5255437d9ca64c05d5aafc7bb22eed..ac559136eb7b74d2056acbd2bdd50d8c95cb87db 100644
--- a/chrome/browser/ui/download/download_tab_helper.h
+++ b/chrome/browser/ui/download/download_tab_helper.h
@@ -10,6 +10,8 @@
 #include "chrome/browser/download/save_package.h"
 #include "content/browser/tab_contents/tab_contents_observer.h"
 
+class DownloadItem;
+class DownloadTabHelperDelegate;
 class TabContentsWrapper;
 
 // Per-tab download controller. Handles dealing with various per-tab download
@@ -19,6 +21,9 @@ class DownloadTabHelper : public TabContentsObserver {
   explicit DownloadTabHelper(TabContentsWrapper* tab_contents);
   virtual ~DownloadTabHelper();
 
+  DownloadTabHelperDelegate* delegate() const { return delegate_; }
+  void set_delegate(DownloadTabHelperDelegate* d) { delegate_ = d; }
+
   // Prepare for saving the current web page to disk.
   void OnSavePage();
 
@@ -35,9 +40,17 @@ class DownloadTabHelper : public TabContentsObserver {
   // Returns the SavePackage which manages the page saving job. May be NULL.
   SavePackage* save_package() const { return save_package_.get(); }
 
+  // Notifies the delegate that a download is about to be started.
+  // This notification is fired before a local temporary file has been created.
+  bool CanDownload(int request_id);
+
+  // Notifies the delegate that a download started.
+  void OnStartDownload(DownloadItem* download);
+
  private:
   // TabContentsObserver overrides.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void DidGetUserGesture() OVERRIDE;
 
   // SavePackage, lazily created.
   scoped_refptr<SavePackage> save_package_;
@@ -45,6 +58,10 @@ class DownloadTabHelper : public TabContentsObserver {
   // Owning TabContentsWrapper.
   TabContentsWrapper* tab_contents_wrapper_;
 
+  // Delegate for notifying our owner (usually Browser) about stuff. Not owned
+  // by us.
+  DownloadTabHelperDelegate* delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadTabHelper);
 };