Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.cc

Index: chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc b/chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.cc
similarity index 98%
rename from chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc
rename to chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.cc
index 617f7c565d3fee20470aeca60172201daa8c77f4..56d8fd138acd8c7c6a65d10623ea7eca937292d1 100644
--- a/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h"
+#include "chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
@@ -23,7 +23,7 @@
 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
 #include "ui/gfx/x/x11_types.h"
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 X11InputMethodContextImplGtk2::X11InputMethodContextImplGtk2(
     ui::LinuxInputMethodContextDelegate* delegate,
@@ -313,4 +313,4 @@ void X11InputMethodContextImplGtk2::OnPreeditStart(GtkIMContext* context) {
   delegate_->OnPreeditStart();
 }
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui