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 bdd75cc4d58c2eb7c6cc8cabcdf19b80154d5bef..892d891394a5c1911b6150626ea93ff62d6925fb 100644
--- a/chrome/browser/download/download_danger_prompt.cc
+++ b/chrome/browser/download/download_danger_prompt.cc
@@ -42,6 +42,7 @@ class DownloadDangerPromptImpl
   virtual string16 GetAcceptButtonTitle() OVERRIDE;
   virtual void OnAccepted() OVERRIDE;
   virtual void OnCanceled() OVERRIDE;
+  virtual void OnDismissed() OVERRIDE;
 
   // Runs |callback|. PrepareToClose() is called beforehand. Doing so prevents
   // this object from responding to state changes in |download_| that might
@@ -146,6 +147,10 @@ void DownloadDangerPromptImpl::OnCanceled() {
   RunCallback(canceled_);
 }
 
+void DownloadDangerPromptImpl::OnDismissed() {
+  RunCallback(canceled_);
+}
+
 void DownloadDangerPromptImpl::RunCallback(const base::Closure& callback) {
   // Invoking the callback can cause the download item state to change or cause
   // the constrained window to close, and |callback| refers to a member