Convert //extensions/renderer from scoped_ptr to std::unique_ptr

extensions/renderer/extensions_render_frame_observer.cc

Index: extensions/renderer/extensions_render_frame_observer.cc
diff --git a/extensions/renderer/extensions_render_frame_observer.cc b/extensions/renderer/extensions_render_frame_observer.cc
index 3f66f46256a2025ffeb6cee34962dbd241f03711..ce410630f5542cbf1fab7e64ac879e0c5d786b51 100644
--- a/extensions/renderer/extensions_render_frame_observer.cc
+++ b/extensions/renderer/extensions_render_frame_observer.cc
@@ -54,7 +54,8 @@ StackTrace GetStackTraceFromMessage(base::string16* message,
   // If we got a stack trace, parse each frame from the text.
   if (index < pieces.size()) {
     for (; index < pieces.size(); ++index) {
-      scoped_ptr<StackFrame> frame = StackFrame::CreateFromText(pieces[index]);
+      std::unique_ptr<StackFrame> frame =
+          StackFrame::CreateFromText(pieces[index]);
       if (frame.get())
         result.push_back(*frame);
     }