Remove NaCl.Startups histogram, this data is tracked in the NaCl plugin now

chrome/browser/tabs/default_tab_handler.cc

Index: chrome/browser/tabs/default_tab_handler.cc
===================================================================
--- chrome/browser/tabs/default_tab_handler.cc	(revision 86641)
+++ chrome/browser/tabs/default_tab_handler.cc	(working copy)
@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/metrics/nacl_histogram.h"
 #include "chrome/browser/tabs/default_tab_handler.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/browser.h"
@@ -14,7 +13,6 @@
     : delegate_(delegate),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           model_(new TabStripModel(this, delegate->GetProfile()))) {
-  UmaNaclHistogramEnumeration(FIRST_TAB_NACL_BASELINE);
   model_->AddObserver(this);
 }
 
@@ -35,7 +33,6 @@
 // DefaultTabHandler, TabStripModelDelegate implementation:
 
 TabContentsWrapper* DefaultTabHandler::AddBlankTab(bool foreground) {
-  UmaNaclHistogramEnumeration(NEW_TAB_NACL_BASELINE);
   return delegate_->AsBrowser()->AddBlankTab(foreground);
 }