Settings UI: Fix and re-enable some tests with Polymer 2

Re-enabling:
CrSettingsCrostiniPageTest.All
since it now seems to be passing on ToT.

Fixing and re-enabling:
CrSettingsBluetoothPageTest.All

Bug: 875454
Change-Id: I0a4211439267d5e9efc9a4cb6a04e6964ba0e7fd
Reviewed-on: https://chromium-review.googlesource.com/c/1265824Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597375}

chrome/test/data/webui/settings/fake_bluetooth_private.js

@@ -47,8 +47,9 @@ cr.define('settings', function() {
 
     /** @override */
     connect: function(address, opt_callback) {
-      const device =
+      let device =
           this.bluetoothApi_.getDeviceForTest(address) || {address: address};
+      device = Object.assign({}, device);
       device.paired = true;
       device.connecting = true;
       this.bluetoothApi_.updateDeviceForTest(device);

testing/buildbot/filters/webui_polymer2_browser_tests.filter

@@ -33,8 +33,6 @@
 -ActiveDirectoryJoinTest.TestActiveDirectoryEnrollment_ErrorCard
 -ActiveDirectoryJoinTest.TestActiveDirectoryEnrollment_Success
 -ActiveDirectoryJoinTest.TestActiveDirectoryEnrollment_UIErrors
--CrSettingsBluetoothPageTest.All
--CrSettingsCrostiniPageTest.All
 -CrSettingsFingerprintProgressArcTest.All
 -CrSettingsMultidevicePageTest.All
 -CrSettingsPeoplePageLockScreenTest.All
@@ -117,12 +115,14 @@ CrSettingsAnimatedPagesTest.*
 CrSettingsAppearanceFontsPageTest.*
 CrSettingsAppearancePageTest.*
 CrSettingsAutofillSectionTest.*
+CrSettingsBluetoothPageTest.*
 CrSettingsCategoryDefaultSettingTest.*
 CrSettingsCategorySettingExceptionsTest.*
 CrSettingsCertificateManagerTest.*
 CrSettingsChangePasswordPageTest.*
 CrSettingsCheckboxTest.*
 CrSettingsChromeCleanupPageTest.*
+CrSettingsCrostiniPageTest.*
 CrSettingsDateTimePageTest.*
 CrSettingsDefaultBrowserTest.*
 CrSettingsDevicePageTest.*