Disabled WebXR features.

Chromium change:

https://chromium.googlesource.com/chromium/src/+/17998a4e8a4a855668a98ef7af72273ad6e4a658

commit 17998a4e8a4a855668a98ef7af72273ad6e4a658
Author: Alex Cooper <alcooper@chromium.org>
Date:   Fri Oct 11 19:24:02 2019 +0000

    Enable WebXR feature by default

    This feature is intended to ship in 79, so the feature needs to be
    enabled.

    Intent to Ship:
    https://groups.google.com/a/chromium.org/d/msg/blink-dev/CHCM_xALBG4/JeQQYkONBwAJ

    Bug: 1007537

https://chromium.googlesource.com/chromium/src/+/755e5ce23981c33575207caef9cbe6a3194931df

commit 755e5ce23981c33575207caef9cbe6a3194931df
Author: Alex Cooper <alcooper@chromium.org>
Date:   Wed Oct 16 19:58:00 2019 +0000

    Enable WebXR Gamepad Module by default

    This feature is intended to ship in 79, so the flag should be enabled
    by default.

    Intent to Ship:
    https://groups.google.com/a/chromium.org/d/msg/blink-dev/Nvll21RaKwM/fTn8qUaNBwAJ

    Bug: 1013739

Author: mkarolin

app/brave_main_delegate.cc

@@ -169,6 +169,8 @@ bool BraveMainDelegate::BasicStartupComplete(int* exit_code) {
       features::kLookalikeUrlNavigationSuggestionsUI.name,
       features::kNotificationTriggers.name,
       features::kSmsReceiver.name,
+      features::kWebXr.name,
+      features::kWebXrGamepadModule.name,
       unified_consent::kUnifiedConsent.name,
       switches::kSyncUSSBookmarks.name,
   };

app/brave_main_delegate_browsertest.cc

@@ -48,6 +48,8 @@ IN_PROC_BROWSER_TEST_F(BraveMainDelegateBrowserTest, DisabledFeatures) {
       &features::kDefaultEnableOopRasterization,
       &features::kNotificationTriggers,
       &features::kSmsReceiver,
+      &features::kWebXr,
+      &features::kWebXrGamepadModule,
       &unified_consent::kUnifiedConsent,
       &features::kLookalikeUrlNavigationSuggestionsUI,
       &switches::kSyncUSSBookmarks,