Remove scoped_refptr::release which is confusing and causes leaks.

chrome/browser/extensions/api/page_capture/page_capture_api.cc

Index: chrome/browser/extensions/api/page_capture/page_capture_api.cc
diff --git a/chrome/browser/extensions/api/page_capture/page_capture_api.cc b/chrome/browser/extensions/api/page_capture/page_capture_api.cc
index 8c58db6227345d67925340b40508bebe6f6c6b7b..172e931e0306d6da1ee48cad9aa45af8f215594e 100644
--- a/chrome/browser/extensions/api/page_capture/page_capture_api.cc
+++ b/chrome/browser/extensions/api/page_capture/page_capture_api.cc
@@ -44,8 +44,10 @@ PageCaptureSaveAsMHTMLFunction::PageCaptureSaveAsMHTMLFunction() {
 
 PageCaptureSaveAsMHTMLFunction::~PageCaptureSaveAsMHTMLFunction() {
   if (mhtml_file_.get()) {
-    BrowserThread::ReleaseSoon(BrowserThread::IO, FROM_HERE,
-                               mhtml_file_.release());
+    webkit_blob::ShareableFileReference* to_release = mhtml_file_.get();
+    to_release->AddRef();
+    mhtml_file_ = NULL;
+    BrowserThread::ReleaseSoon(BrowserThread::IO, FROM_HERE, to_release);
   }
 }