Stop showing Save to Drive in Destination Dialog for CrOS

With the impending deprecation of Google Cloud Print (GCP), CrOS has
shifted to implementing Save to Drive using the local Drive folder. Thus
the Save to Drive option should be removed from Destination Dialog which
has an account picker. Without GCP, the user no longer has the ability
to choose which account's Drive to save to.

Bug: 1112416
Change-Id: I985ebae6948a96e6698edad11b580cb3a87ff361
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387427Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805141}

chrome/browser/resources/print_preview/ui/destination_dialog.js

@@ -24,6 +24,7 @@ import {assert} from 'chrome://resources/js/assert.m.js';
 import {EventTracker} from 'chrome://resources/js/event_tracker.m.js';
 import {I18nBehavior} from 'chrome://resources/js/i18n_behavior.m.js';
 import {ListPropertyUpdateBehavior} from 'chrome://resources/js/list_property_update_behavior.m.js';
+import {loadTimeData} from 'chrome://resources/js/load_time_data.m.js';
 import {beforeNextRender, html, Polymer} from 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js';
 
 import {Destination} from '../data/destination.js';
@@ -93,6 +94,17 @@ Polymer({
       type: Object,
       value: null,
     },
+
+    // <if expr="chromeos">
+    /** @private */
+    saveToDriveFlagEnabled_: {
+      type: Boolean,
+      value() {
+        return loadTimeData.getBoolean('printSaveToDrive');
+      },
+      readOnly: true,
+    },
+    // </if>
   },
 
   listeners: {
@@ -197,12 +209,32 @@ Polymer({
 
     this.updateList(
         'destinations_', destination => destination.key,
-        this.destinationStore.destinations(this.activeUser));
+        this.getDestinationList_());
 
     this.loadingDestinations_ =
         this.destinationStore.isPrintDestinationSearchInProgress;
   },
 
+  /**
+   * @return {!Array<!Destination>}
+   * @private
+   */
+  getDestinationList_() {
+    const destinations = this.destinationStore.destinations(this.activeUser);
+    // <if expr="chromeos">
+    // When |saveToDriveFlagEnabled_| is true, we don't want to show a
+    // 'Save to Drive' option in the destination dialog.
+    if (this.saveToDriveFlagEnabled_) {
+      return destinations.filter(
+          destination => destination.id !== Destination.GooglePromotedId.DOCS &&
+              destination.id !==
+                  Destination.GooglePromotedId.SAVE_TO_DRIVE_CROS);
+    }
+    // </if>
+
+    return destinations;
+  },
+
   /** @private */
   onCloseOrCancel_() {
     if (this.searchQuery_) {