GN(android) Don't enable --gc-sections in debug mode.

ui/message_center/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("message_center") {
   deps = [
     "//base",
-    "//base:i18n",
-    "//base/third_party/dynamic_annotations",
-    "//components/url_formatter",
-    "//skia",
-    "//ui/accessibility",
     "//ui/base",
-    "//ui/events",
-    "//ui/gfx",
-    "//ui/gfx/geometry",
-    "//ui/native_theme",
-    "//ui/resources",
-    "//ui/strings",
     "//url",
   ]
 
-  configs += [
-    "//build/config:precompiled_headers",
-
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    "//build/config/compiler:no_size_t_to_int_warning",
-  ]
-
   defines = [ "MESSAGE_CENTER_IMPLEMENTATION" ]
 
   if (enable_notifications && !is_android) {
+    deps += [
+      "//base:i18n",
+      "//base/third_party/dynamic_annotations",
+      "//components/url_formatter",
+      "//skia",
+      "//ui/accessibility",
+      "//ui/events",
+      "//ui/gfx",
+      "//ui/gfx/geometry",
+      "//ui/native_theme",
+      "//ui/resources",
+      "//ui/strings",
+    ]
+
+    configs += [
+      "//build/config:precompiled_headers",
+
+      # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+      "//build/config/compiler:no_size_t_to_int_warning",
+    ]
     sources = [
       "cocoa/notification_controller.h",
       "cocoa/notification_controller.mm",
       "cocoa/opaque_views.h",
       "cocoa/opaque_views.mm",
       "cocoa/popup_collection.h",
       "cocoa/popup_collection.mm",
       "cocoa/popup_controller.h",
       "cocoa/popup_controller.mm",
       "message_center.cc",
@@ skipping 99 matching lines @@
       sources += [
         "notification.cc",
         "notification.h",
         "notifier_settings.cc",
         "notifier_settings.h",
       ]
     }
   }
 }
 
-static_library("test_support") {
+source_set("test_support") {
   testonly = true
-  sources = [
-    "fake_message_center.cc",
-    "fake_message_center.h",
-    "fake_message_center_tray_delegate.cc",
-    "fake_message_center_tray_delegate.h",
-    "fake_notifier_settings_provider.cc",
-    "fake_notifier_settings_provider.h",
-  ]
+
+  if (enable_notifications && !is_android) {
+    sources = [
+      "fake_message_center.cc",
+      "fake_message_center.h",
+      "fake_message_center_tray_delegate.cc",
+      "fake_message_center_tray_delegate.h",
+      "fake_notifier_settings_provider.cc",
+      "fake_notifier_settings_provider.h",
+    ]
+    deps = [
+      "//base",
+      "//base/test:test_support",
+      "//skia",
+      "//ui/gfx",
+      "//ui/gfx/geometry",
+    ]
+  }
 
   public_deps = [
     ":message_center",
   ]
-
-  deps = [
-    "//base",
-    "//base/test:test_support",
-    "//skia",
-    "//ui/gfx",
-    "//ui/gfx/geometry",
-  ]
 }
 
 test("message_center_unittests") {
   sources = [
     "test/run_all_unittests.cc",
   ]
 
   deps = [
     ":message_center",
     ":test_support",
@@ skipping 39 matching lines @@
       deps += [
         # Compositor is needed by message_center_view_unittest.cc and for the
         # fonts used by bounded_label_unittest.cc.
         "//ui/compositor",
         "//ui/views",
         "//ui/views:test_support",
       ]
     }
   }  # enable_notifications && !is_android
 }