Make extension installation work when the "ask for destination

chrome/browser/download/download_manager.cc

Index: chrome/browser/download/download_manager.cc
diff --git a/chrome/browser/download/download_manager.cc b/chrome/browser/download/download_manager.cc
index a6b99372cdba847d81a883921c180ea419601c78..b9925e73c0ab5a130fb8e9363e8a18b32c908b6b 100644
--- a/chrome/browser/download/download_manager.cc
+++ b/chrome/browser/download/download_manager.cc
@@ -566,8 +566,13 @@ void DownloadManager::StartDownload(DownloadCreateInfo* info) {
   // Freeze the user's preference for showing a Save As dialog.  We're going to
   // bounce around a bunch of threads and we don't want to worry about race
   // conditions where the user changes this pref out from under us.
-  if (*prompt_for_download_)
-    info->save_as = true;
+  if (*prompt_for_download_) {
+    // But never obey the preference for extension installation. Note that we
+    // only care here about the case where an extension is installed, not when
+    // one is downloaded with "save as...".
+    if (!IsExtensionInstall(info))
+      info->save_as = true;
+  }
 
   // Determine the proper path for a download, by choosing either the default
   // download directory, or prompting the user.