Improve some naming

chrome/browser/ui/libgtk2ui/gtk2_border.cc

Index: chrome/browser/ui/libgtk2ui/gtk2_border.cc
diff --git a/chrome/browser/ui/libgtk2ui/gtk2_border.cc b/chrome/browser/ui/libgtk2ui/gtk2_border.cc
index eefa5a49c7c227fedb6d6d56e240f56724b7f253..67abbd89baa288cd9f013a48ef92aeb9b5d348da 100644
--- a/chrome/browser/ui/libgtk2ui/gtk2_border.cc
+++ b/chrome/browser/ui/libgtk2ui/gtk2_border.cc
@@ -76,16 +76,16 @@ Gtk2Border::Gtk2Border(Gtk2UI* gtk2_ui,
     : gtk2_ui_(gtk2_ui),
       owning_button_(owning_button),
       border_(border.Pass()) {
-  gtk2_ui_->AddNativeThemeChangeObserver(this);
+  gtk2_ui_->AddSystemThemeChangeObserver(this);
 }
 
 Gtk2Border::~Gtk2Border() {
-  gtk2_ui_->RemoveNativeThemeChangeObserver(this);
+  gtk2_ui_->RemoveSystemThemeChangeObserver(this);
 }
 
 void Gtk2Border::Paint(const views::View& view, gfx::Canvas* canvas) {
   ui::ThemeProvider* provider = owning_button_->GetThemeProvider();
-  if (!provider || !provider->UsingNativeTheme()) {
+  if (!provider || !provider->UsingSystemTheme()) {
     border_->Paint(view, canvas);
     return;
   }
@@ -127,7 +127,7 @@ gfx::Insets Gtk2Border::GetInsets() const {
   // the buttons which are just toolbar images.
   ui::ThemeProvider* provider = owning_button_->GetThemeProvider();
   if (owning_button_->style() == views::Button::STYLE_BUTTON ||
-      (!provider || !provider->UsingNativeTheme()))
+      (!provider || !provider->UsingSystemTheme()))
     return border_->GetInsets();
 
   // On STYLE_TEXTUBTTON, we want the smaller insets so we can fit the GTK icon
@@ -137,14 +137,14 @@ gfx::Insets Gtk2Border::GetInsets() const {
 
 gfx::Size Gtk2Border::GetMinimumSize() const {
   ui::ThemeProvider* provider = owning_button_->GetThemeProvider();
-  if (!provider || !provider->UsingNativeTheme())
+  if (!provider || !provider->UsingSystemTheme())
     return border_->GetMinimumSize();
 
   gfx::Insets insets = GetInsets();
   return gfx::Size(insets.width(), insets.height());
 }
 
-void Gtk2Border::OnNativeThemeChanged() {
+void Gtk2Border::OnSystemThemeChanged() {
   for (int i = 0; i < kNumberOfFocusedStates; ++i) {
     for (int j = 0; j < views::Button::STATE_COUNT; ++j) {
       button_images_[i][j] = gfx::ImageSkia();