Don't reference instrumented-libraryes with sanitizers disabled.

build/config/sanitizers/BUILD.gn

 # Copyright 2014 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")
 
 # Contains the dependencies needed for sanitizers to link into executables and
 # shared_libraries. Unconditionally depend upon this target as it is empty if
 # |is_asan|, |is_lsan|, |is_tsan|, |is_msan| and |use_custom_libcxx| are false.
 group("deps") {
-  deps = [
-    "//third_party/instrumented_libraries:deps",
-  ]
   if (is_asan || is_lsan || is_tsan || is_msan) {
     public_configs = [ ":sanitizer_options_link_helper" ]
-    deps += [ ":options_sources" ]
-  }
-  if (use_custom_libcxx) {
-    deps += [ "//buildtools/third_party/libc++:libcxx_proxy" ]
+    deps = [
+      ":options_sources",
+    ]
+
+    if (use_prebuilt_instrumented_libraries) {
+      deps += [ "//third_party/instrumented_libraries:deps" ]
+    }
+    if (use_custom_libcxx) {
+      deps += [ "//buildtools/third_party/libc++:libcxx_proxy" ]
+    }
   }
 }
 
 config("sanitizer_options_link_helper") {
   ldflags = [ "-Wl,-u_sanitizer_options_link_helper" ]
   if (is_asan) {
     ldflags += [ "-fsanitize=address" ]
   }
   if (is_lsan) {
     ldflags += [ "-fsanitize=leak" ]
@@ skipping 20 matching lines @@
   }
 
   if (is_lsan) {
     sources += [ "//build/sanitizers/lsan_suppressions.cc" ]
   }
 
   if (is_tsan) {
     sources += [ "//build/sanitizers/tsan_suppressions.cc" ]
   }
 }