Eliminate redundancy in the parameters to NotifyEntryChanged.

content/browser/frame_host/navigation_entry_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/navigation_entry_impl.h"
 
 #include <queue>
 
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
@@ skipping 33 matching lines @@
 
 NavigationEntry* NavigationEntry::Create() {
   return new NavigationEntryImpl();
 }
 
 NavigationEntryImpl* NavigationEntryImpl::FromNavigationEntry(
     NavigationEntry* entry) {
   return static_cast<NavigationEntryImpl*>(entry);
 }
 
+const NavigationEntryImpl* NavigationEntryImpl::FromNavigationEntry(
+    const NavigationEntry* entry) {
+  return static_cast<const NavigationEntryImpl*>(entry);
+}
+
 NavigationEntryImpl::NavigationEntryImpl()
     : NavigationEntryImpl(nullptr, -1, GURL(), Referrer(), base::string16(),
                           ui::PAGE_TRANSITION_LINK, false) {
 }
 
 NavigationEntryImpl::NavigationEntryImpl(SiteInstanceImpl* instance,
                                          int page_id,
                                          const GURL& url,
                                          const Referrer& referrer,
                                          const base::string16& title,
@@ skipping 459 matching lines @@
   screenshot_ = png_data;
   if (screenshot_.get())
     UMA_HISTOGRAM_MEMORY_KB("Overscroll.ScreenshotSize", screenshot_->size());
 }
 
 GURL NavigationEntryImpl::GetHistoryURLForDataURL() const {
   return GetBaseURLForDataURL().is_empty() ? GURL() : GetVirtualURL();
 }
 
 }  // namespace content