Dismiss action in tab modal dialogs.

chrome/browser/download/download_danger_prompt.cc

Index: chrome/browser/download/download_danger_prompt.cc
diff --git a/chrome/browser/download/download_danger_prompt.cc b/chrome/browser/download/download_danger_prompt.cc
index 7368b0bba02b889835bc5db66d9d98cb0bf1e8f3..9e2c4ca1a4a0478ee6d3232e08da00257ce362f2 100644
--- a/chrome/browser/download/download_danger_prompt.cc
+++ b/chrome/browser/download/download_danger_prompt.cc
@@ -41,6 +41,7 @@ class DownloadDangerPromptImpl
   virtual string16 GetAcceptButtonTitle() OVERRIDE;
   virtual void OnAccepted() OVERRIDE;
   virtual void OnCanceled() OVERRIDE;
+  virtual void OnClosed() OVERRIDE;
 
   void RunDone(Action action);
 
@@ -142,6 +143,10 @@ void DownloadDangerPromptImpl::OnCanceled() {
   RunDone(CANCEL);
 }
 
+void DownloadDangerPromptImpl::OnClosed() {
+  RunDone(CANCEL);
+}
+
 void DownloadDangerPromptImpl::RunDone(Action action) {
   // Invoking the callback can cause the download item state to change or cause
   // the constrained window to close, and |callback| refers to a member