Fix crashes in DownloadRequestLimiter when extension popups/bubbles initiate downloads automatically

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index ff721c6958adf61d3824fcf6d00fd95618694a09..c6f231b0e62e14616b2bdff8cc9a73d32d3ebd43 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -58,6 +58,7 @@
 
 using WebKit::WebDragOperation;
 using WebKit::WebDragOperationsMask;
+using content::DownloadItem;
 using content::NativeWebKeyboardEvent;
 using content::OpenURLParams;
 using content::RenderViewHost;
@@ -409,6 +410,17 @@ void ExtensionHost::CloseContents(WebContents* contents) {
   }
 }
 
+void ExtensionHost::OnStartDownload(
+    WebContents* source, DownloadItem* download) {
+  Profile* profile = Profile::FromBrowserContext(source->GetBrowserContext());
+  Browser* browser = browser::FindTabbedBrowser(
+      profile, false);  // Match incognito exactly.
+  if (!browser && view())
+    browser = view()->browser();
+  if (browser)
+    browser->OnStartDownload(source, download);
+}
+
 void ExtensionHost::WillRunJavaScriptDialog() {
   ExtensionProcessManager* pm =
       ExtensionSystem::Get(profile_)->process_manager();