Flip LKGR/ClusterFuzz, WebKit MSAN bots back to GYP

third_party/instrumented_libraries/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/sanitizers/sanitizers.gni")
 
 group("deps") {
   if (use_prebuilt_instrumented_libraries) {
-    assert(prebuilt_available,
+    assert(prebuilt_instrumented_libraries_available,
            "Prebuilt instrumented libraries are only available when " +
                "is_msan = true and msan_track_origins = {0, 2}")
     deps = [
       ":prebuilt",
     ]
     data_deps = [
       ":prebuilt",
     ]
   }
 }
@@ skipping 43 matching lines @@
   config("prebuilt_ldflags") {
     ldflags = [
       # Add a relative RPATH entry to Chromium binaries. This puts instrumented
       # DSOs before system-installed versions in library search path.
       "-Wl,-R,\$ORIGIN/instrumented_libraries_prebuilt/$sanitizer_type/lib",
       "-Wl,-z,origin",
     ]
   }
 }
 # TODO(GYP): Support building instrumented libraries from source.