Update the remaining references to sys_string_conversions.h to its new location.

webkit/plugins/npapi/webplugin_delegate_impl_mac.mm

 // 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 "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
 #import <Cocoa/Cocoa.h>
 #import <QuartzCore/QuartzCore.h>
 #include <unistd.h>
 
 #include <set>
 #include <string>
 
 #include "base/mac/mac_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/stats_counters.h"
 #include "base/string_util.h"
-#include "base/sys_string_conversions.h"
+#include "base/strings/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "skia/ext/skia_utils_mac.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "webkit/plugins/npapi/plugin_instance.h"
 #include "webkit/plugins/npapi/plugin_lib.h"
 #include "webkit/plugins/npapi/plugin_web_event_converter_mac.h"
 #include "webkit/plugins/npapi/webplugin.h"
 #include "webkit/plugins/npapi/webplugin_accelerated_surface_mac.h"
 
@@ skipping 690 matching lines @@
   [CATransaction commit];
 
   [renderer_ setBounds:[layer_ bounds]];
   surface_->SetSize(window_rect_.size());
   // Kick off the drawing timer, if necessary.
   PluginVisibilityChanged();
 }
 
 }  // namespace npapi
 }  // namespace webkit