Diable cloud import when Files.app launches as a dialog.

- instantiate ImportController only when the Files.app type is PAGE_FULL.
- remove unused flag 'importEnabled_'.

BUG=454148
TEST=manual test

Review URL: https://codereview.chromium.org/1109073002

Cr-Commit-Position: refs/heads/master@{#327305}

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

@@ -261,13 +261,6 @@ function FileManager() {
    * @private
    */
   this.initializeQueue_ = new AsyncUtil.Group();
-
-  /**
-   * Indicates whether cloud import is enabled.  This is initialized in
-   * #initSettings.
-   * @private {boolean}
-   */
-  this.importEnabled_ = true;
 }
 
 FileManager.prototype = /** @struct */ {
@@ -374,17 +367,7 @@ FileManager.prototype = /** @struct */ {
 (function() {
   FileManager.prototype.initSettings_ = function(callback) {
     this.appStateController_ = new AppStateController(this.dialogType);
-    var whenViewOptionsLoaded =
-        this.appStateController_.loadInitialViewOptions();
-    var whenImportFlagLoaded = importer.importEnabled().then(
-        function(enabled) {
-          this.importEnabled_ = enabled;
-        }.bind(this));
-
-    Promise.all([
-      whenViewOptionsLoaded,
-      whenImportFlagLoaded
-    ]).then(callback);
+    this.appStateController_.loadInitialViewOptions().then(callback);
   };
 
   /**
@@ -444,19 +427,21 @@ FileManager.prototype = /** @struct */ {
         this.ui_.emptyFolder,
         this.directoryModel_);
 
-    importer.importEnabled().then(
-        function(enabled) {
-          if (enabled) {
-            this.importController_ = new importer.ImportController(
-                new importer.RuntimeControllerEnvironment(
-                    this,
-                    assert(this.selectionHandler_)),
-                assert(this.mediaScanner_),
-                assert(this.mediaImportHandler_),
-                new importer.RuntimeCommandWidget(),
-                assert(this.tracker_));
-          }
-        }.bind(this));
+    if (this.dialogType === DialogType.FULL_PAGE) {
+      importer.importEnabled().then(
+          function(enabled) {
+            if (enabled) {
+              this.importController_ = new importer.ImportController(
+                  new importer.RuntimeControllerEnvironment(
+                      this,
+                      assert(this.selectionHandler_)),
+                  assert(this.mediaScanner_),
+                  assert(this.mediaImportHandler_),
+                  new importer.RuntimeCommandWidget(),
+                  assert(this.tracker_));
+            }
+          }.bind(this));
+    }
 
     assert(this.fileFilter_);
     assert(this.namingController_);