Revert of Leave fullscreen mode in an app window when ESC key is pressed.

apps/shell_window.cc

Index: apps/shell_window.cc
diff --git a/apps/shell_window.cc b/apps/shell_window.cc
index 994328143062755233ee27a45082efa21be52291..2c0b3fac68463847044925154795f0aa9c020271 100644
--- a/apps/shell_window.cc
+++ b/apps/shell_window.cc
@@ -282,39 +282,9 @@
                             initial_pos, user_gesture, was_blocked);
 }
 
-bool ShellWindow::PreHandleKeyboardEvent(
-    content::WebContents* source,
-    const content::NativeWebKeyboardEvent& event,
-    bool* is_keyboard_shortcut) {
-  // Here, we can handle a key event before the content gets it. When we are
-  // fullscreen, we want to allow the user to leave when ESC is pressed.
-  // However, if the application has the "overrideEscFullscreen" permission, we
-  // should let it override that behavior.
-  // ::HandleKeyboardEvent() will only be called if the KeyEvent's default
-  // action is not prevented.
-  // Thus, we should handle the KeyEvent here only if the permission is not set.
-  if (event.windowsKeyCode == ui::VKEY_ESCAPE &&
-      (fullscreen_types_ != FULLSCREEN_TYPE_NONE) &&
-      !extension_->HasAPIPermission(APIPermission::kOverrideEscFullscreen)) {
-    Restore();
-    return true;
-  }
-
-  return false;
-}
-
 void ShellWindow::HandleKeyboardEvent(
     WebContents* source,
     const content::NativeWebKeyboardEvent& event) {
-  // If the window is currently fullscreen, ESC should leave fullscreen.
-  // If this code is being called for ESC, that means that the KeyEvent's
-  // default behavior was not prevented by the content.
-  if (event.windowsKeyCode == ui::VKEY_ESCAPE &&
-      (fullscreen_types_ != FULLSCREEN_TYPE_NONE)) {
-    Restore();
-    return;
-  }
-
   native_app_window_->HandleKeyboardEvent(event);
 }