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 09c1624dbf2d62461355d548ac0e4588ebc9ba8f..472c74a848e7f2e7c9705e06286e90b95d2b497f 100644
--- a/chrome/browser/download/download_danger_prompt.cc
+++ b/chrome/browser/download/download_danger_prompt.cc
@@ -40,6 +40,7 @@ class DownloadDangerPromptImpl
   virtual string16 GetAcceptButtonTitle() OVERRIDE;
   virtual void OnAccepted() OVERRIDE;
   virtual void OnCanceled() OVERRIDE;
+  virtual void OnClosed() OVERRIDE;
 
   void RunDone(Action action);
 
@@ -139,6 +140,10 @@ 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