Revert of Refoctoring FileSelection and FileSelectionHandler.

ui/file_manager/file_manager/foreground/js/dialog_action_controller.js

Index: ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
diff --git a/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js b/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
index b71cb5e84037c4e88e5f89488427e1f19bd8cbb0..369161c98e681909b5b7b66b4ce7d5feec582ae6 100644
--- a/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
+++ b/ui/file_manager/file_manager/foreground/js/dialog_action_controller.js
@@ -116,8 +116,7 @@
   dialogFooter.filenameInput.addEventListener(
       'input', this.updateOkButton_.bind(this));
   fileSelectionHandler.addEventListener(
-      FileSelectionHandler.EventType.CHANGE_THROTTLED,
-      this.onFileSelectionChanged_.bind(this));
+      'change', this.onFileSelectionChanged_.bind(this));
 
   dialogFooter.initFileTypeFilter(
       this.fileTypes_, launchParam.includeAllFiles);
@@ -412,13 +411,7 @@
     this.dialogFooter_.filenameInput.value = selection.entries[0].name;
   }
 
-  selection.completeInit().then(function() {
-    if (this.fileSelectionHandler_.selection !== selection)
-      return;
-    this.updateOkButton_();
-    if (!this.dialogFooter_.okButton.disable)
-      util.testSendMessage('dialog-ready');
-  }.bind(this));
+  this.updateOkButton_();
 };
 
 /**
@@ -449,19 +442,27 @@
     return;
   }
 
+  var isDriveOffline =
+      this.volumeManager_.getDriveConnectionState().type ===
+      VolumeManagerCommon.DriveConnectionType.OFFLINE;
+  var filesAvailable =
+      !this.directoryModel_.isOnDrive() ||
+      !isDriveOffline ||
+      selection.allDriveFilesPresent;
+
   if (this.dialogType_ === DialogType.SELECT_OPEN_FILE) {
     this.dialogFooter_.okButton.disabled =
+        !filesAvailable ||
         selection.directoryCount !== 0 ||
-        selection.fileCount !== 1 ||
-        !this.fileSelectionHandler_.isAvailable();
+        selection.fileCount !== 1;
     return;
   }
 
   if (this.dialogType_ === DialogType.SELECT_OPEN_MULTI_FILE) {
     this.dialogFooter_.okButton.disabled =
+        !filesAvailable ||
         selection.directoryCount !== 0 ||
-        selection.fileCount === 0 ||
-        !this.fileSelectionHandler_.isAvailable();
+        selection.fileCount === 0;
     return;
   }