Gtk3 ui: Add libgtk3ui as a separate build component

chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.h

Index: chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.h
diff --git a/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h b/chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.h
similarity index 92%
rename from chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h
rename to chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.h
index fe8b19fce7adae5eae7f12e147035445fbd32945..c80b22fe20fab333bd9bf2cdbe6e96c4d3049be8 100644
--- a/chrome/browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2.h
+++ b/chrome/browser/ui/libgtkui/x11_input_method_context_impl_gtk2.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_UI_LIBGTK2UI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
-#define CHROME_BROWSER_UI_LIBGTK2UI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
+#ifndef CHROME_BROWSER_UI_LIBGTKUI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
+#define CHROME_BROWSER_UI_LIBGTKUI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
 
 #include <vector>
 
@@ -19,7 +19,7 @@
 typedef union _GdkEvent GdkEvent;
 typedef struct _GtkIMContext GtkIMContext;
 
-namespace libgtk2ui {
+namespace libgtkui {
 
 // An implementation of LinuxInputMethodContext which is based on X11 event loop
 // and uses GtkIMContext(gtk-immodule) as a bridge from/to underlying IMEs.
@@ -89,6 +89,6 @@ class X11InputMethodContextImplGtk2 : public ui::LinuxInputMethodContext {
   DISALLOW_COPY_AND_ASSIGN(X11InputMethodContextImplGtk2);
 };
 
-}  // namespace libgtk2ui
+}  // namespace libgtkui
 
-#endif  // CHROME_BROWSER_UI_LIBGTK2UI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_
+#endif  // CHROME_BROWSER_UI_LIBGTKUI_X11_INPUT_METHOD_CONTEXT_IMPL_GTK2_H_