Skip base::string16 if not necessary for WebString <-> ASCII conversion

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index a20ef4d509906ad6416e2038fe64c3a89545c9dc..8f715bb6e44a99ced99116e2c1c7f9264fed24d9 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -950,7 +950,7 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
   settings->setMinimumFontSize(prefs.minimum_font_size);
   settings->setMinimumLogicalFontSize(prefs.minimum_logical_font_size);
   settings->setDefaultTextEncodingName(
-      base::ASCIIToUTF16(prefs.default_encoding));
+      WebString::fromASCII(prefs.default_encoding));
   settings->setJavaScriptEnabled(prefs.javascript_enabled);
   settings->setWebSecurityEnabled(prefs.web_security_enabled);
   settings->setJavaScriptCanOpenWindowsAutomatically(
@@ -1112,7 +1112,7 @@ void RenderView::ApplyWebPreferences(const WebPreferences& prefs,
   settings->setMediaPlaybackRequiresUserGesture(
       prefs.user_gesture_required_for_media_playback);
   settings->setDefaultVideoPosterURL(
-      base::ASCIIToUTF16(prefs.default_video_poster_url.spec()));
+      WebString::fromASCII(prefs.default_video_poster_url.spec()));
   settings->setSupportDeprecatedTargetDensityDPI(
       prefs.support_deprecated_target_density_dpi);
   settings->setUseLegacyBackgroundSizeShorthandBehavior(