Remove ENABLE_VR_SHELL compile-time define.

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index a8d36663dc3d0e634c6ef404c3d8468e93a84d2b..906d32337c4d7f78ecfbeb3b41b75a78182df678 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -97,7 +97,7 @@
 
     'chromium.fyi': {
       'Afl Upload Linux ASan': 'release_afl_asan',
-      'Android Builder (dbg)': 'android_debug_static_bot_vr_shell',
+      'Android Builder (dbg)': 'android_debug_static_bot',
       'Android Builder Goma Canary (dbg)': 'android_debug_bot',
       'Android deterministic': 'android_without_codecs_release_bot_minimal_symbols',
       'Android deterministic (dbg)': 'android_debug_bot',
@@ -832,10 +832,6 @@
       'android', 'debug_static_bot', 'x86',
     ],
 
-    'android_debug_static_bot_vr_shell': [
-      'android', 'debug_static_bot', 'vr_shell',
-    ],
-
     'android_debug_static_minimal_symbols_mipsel': [
       'android', 'debug', 'static', 'minimal_symbols', 'mipsel',
     ],
@@ -1890,10 +1886,6 @@
       'gn_args': 'v8_enable_verify_heap=true',
     },
 
-    'vr_shell': {
-      'gn_args': 'enable_vr_shell=true',
-    },
-
     'win_analyze': {
       'gn_args': 'use_vs_code_analysis=true',
     },