Revert of Gallery: capture escape key in full screen by adding a permission.

ui/file_manager/gallery/js/slide_mode.js

Index: ui/file_manager/gallery/js/slide_mode.js
diff --git a/ui/file_manager/gallery/js/slide_mode.js b/ui/file_manager/gallery/js/slide_mode.js
index fd80c428bd7a99c15a2d02897ecd5b7352b5c695..35a4301398d1ea5de95df3c017842315683d5d22 100644
--- a/ui/file_manager/gallery/js/slide_mode.js
+++ b/ui/file_manager/gallery/js/slide_mode.js
@@ -203,6 +203,7 @@
    */
   this.spinnerTimer_ = null;
 
+  this.context_.appWindow.onRestored.addListener(this.onRestored_.bind(this));
   window.addEventListener('resize', this.onResize_.bind(this));
 
   // ----------------------------------------------------------------
@@ -1108,7 +1109,9 @@
 
   if (this.isSlideshowOn_()) {
     switch (keyID) {
-      case 'U+001B':  // Escape
+      // Escape key is captured by the platform to exit full screen. We handle
+      // it by onRestored event.
+
       case 'MediaStop':
         this.stopSlideshow_(event);
         break;
@@ -1213,6 +1216,17 @@
 };
 
 /**
+ * Restored event handler.
+ * @private
+ */
+SlideMode.prototype.onRestored_ = function() {
+  // Leave slide show since the window should not be in full screen when
+  // onRestored event is dispatched.
+  if (this.isSlideshowOn_())
+    this.stopSlideshow_();
+};
+
+/**
  * Resize handler.
  * @private
  */