views: Convert IsFocusable() to just focusable() since it's just a simple accessor.

ui/views/controls/textfield/textfield.cc

 // Copyright (c) 2011 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 "ui/views/controls/textfield/textfield.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include <gdk/gdkkeysyms.h>
 #endif
 
@@ skipping 74 matching lines @@
 void Textfield::SetController(TextfieldController* controller) {
   controller_ = controller;
 }
 
 TextfieldController* Textfield::GetController() const {
   return controller_;
 }
 
 void Textfield::SetReadOnly(bool read_only) {
   read_only_ = read_only;
+  set_focusable(!read_only);
   if (native_wrapper_) {
     native_wrapper_->UpdateReadOnly();
     native_wrapper_->UpdateTextColor();
     native_wrapper_->UpdateBackgroundColor();
   }
 }
 
 bool Textfield::IsPassword() const {
   return style_ & STYLE_PASSWORD;
 }
@@ skipping 218 matching lines @@
 }
 
 gfx::Size Textfield::GetPreferredSize() {
   gfx::Insets insets;
   if (draw_border_ && native_wrapper_)
     insets = native_wrapper_->CalculateInsets();
   return gfx::Size(font_.GetExpectedTextWidth(default_width_in_chars_) +
                        insets.width(), font_.GetHeight() + insets.height());
 }
 
-bool Textfield::IsFocusable() const {
-  return View::IsFocusable() && !read_only_;
-}
-
 void Textfield::AboutToRequestFocusFromTabTraversal(bool reverse) {
   SelectAll();
 }
 
 bool Textfield::SkipDefaultKeyEventProcessing(const KeyEvent& e) {
   // TODO(hamaji): Figure out which keyboard combinations we need to add here,
   //               similar to LocationBarView::SkipDefaultKeyEventProcessing.
   ui::KeyboardCode key = e.key_code();
   if (key == ui::VKEY_BACK)
     return true;  // We'll handle BackSpace ourselves.
@@ skipping 97 matching lines @@
     }
 #endif
   }
 }
 
 std::string Textfield::GetClassName() const {
   return kViewClassName;
 }
 
 }  // namespace views