Cleanup: Stop creating RenderViewObservers from chrome/ in RenderViewer.

chrome/renderer/print_web_view_helper.cc

Index: chrome/renderer/print_web_view_helper.cc
===================================================================
--- chrome/renderer/print_web_view_helper.cc	(revision 80410)
+++ chrome/renderer/print_web_view_helper.cc	(working copy)
@@ -114,8 +114,11 @@
 }
 
 
+RENDER_VIEW_OBSERVER_TRACKER_MAP(PrintWebViewHelper);
+
 PrintWebViewHelper::PrintWebViewHelper(RenderView* render_view)
     : RenderViewObserver(render_view),
+      RenderViewObserverTracker<PrintWebViewHelper>(render_view),
       print_web_view_(NULL),
       script_initiated_preview_frame_(NULL),
       context_menu_preview_node_(NULL),
@@ -126,7 +129,8 @@
 
 PrintWebViewHelper::~PrintWebViewHelper() {}
 
-void PrintWebViewHelper::ScriptInitiatedPrint(WebKit::WebFrame* frame) {
+// Prints |frame| which called window.print().
+void PrintWebViewHelper::printPage(WebKit::WebFrame* frame) {
   DCHECK(frame);
 
   if (IsScriptInitiatedPrintTooFrequent(frame))