content: Move kViewSourceScheme constant into content namespace.

content/browser/web_contents/navigation_entry_impl.cc

 // Copyright (c) 2012 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/web_contents/navigation_entry_impl.h"
 
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "content/public/common/content_constants.h"
@@ skipping 176 matching lines @@
     string16::size_type slashpos = title.rfind('/');
     if (slashpos != string16::npos)
       title = title.substr(slashpos + 1);
   }
 
   ui::ElideString(title, kMaxTitleChars, &cached_display_title_);
   return cached_display_title_;
 }
 
 bool NavigationEntryImpl::IsViewSourceMode() const {
-  return virtual_url_.SchemeIs(chrome::kViewSourceScheme);
+  return virtual_url_.SchemeIs(kViewSourceScheme);
 }
 
 void NavigationEntryImpl::SetTransitionType(
     PageTransition transition_type) {
   transition_type_ = transition_type;
 }
 
 PageTransition NavigationEntryImpl::GetTransitionType() const {
   return transition_type_;
 }
@@ skipping 104 matching lines @@
 }
 
 void NavigationEntryImpl::SetScreenshotPNGData(
     scoped_refptr<base::RefCountedBytes> png_data) {
   screenshot_ = png_data;
   if (screenshot_)
     UMA_HISTOGRAM_MEMORY_KB("Overscroll.ScreenshotSize", screenshot_->size());
 }
 
 }  // namespace content