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

chrome/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
@@ skipping 944 matching lines @@
     ]
   }
 
   # GYP: //chrome/chrome.gyp:page_info_connection_type_java
   java_cpp_enum("page_info_connection_type_javagen") {
     sources = [
       "browser/ui/android/website_settings_popup_android.h",
     ]
   }
 
+  # Some android targets still depend on --gc-sections to link.
+  # TODO: remove --gc-sections for Debug builds (crbug.com/159847).
+  config("gc_sections") {
+    ldflags = [ "-Wl,--gc-sections" ]
+  }
+
   # GYP: //chrome/chrome_android.gypi:chrome_android_core
-  static_library("chrome_android_core") {
+  source_set("chrome_android_core") {
     sources = [
       "app/android/chrome_android_initializer.cc",
       "app/android/chrome_android_initializer.h",
       "app/android/chrome_jni_onload.cc",
       "app/android/chrome_jni_onload.h",
       "app/android/chrome_main_delegate_android.cc",
       "app/android/chrome_main_delegate_android.h",
       "app/chrome_main_delegate.cc",
       "app/chrome_main_delegate.h",
     ]
+    public_configs = [ ":gc_sections" ]
 
     include_dirs = [ android_ndk_include_dir ]
 
     libs = [
       "android",
       "jnigraphics",
     ]
 
     deps = [
       "//chrome/browser",
@@ skipping 85 matching lines @@
       "//chrome/app/theme/$branding_path_component/product_logo_48.png",
       "//chrome/tools/build/linux/chrome-wrapper",
       "//third_party/xdg-utils/scripts/xdg-mime",
       "//third_party/xdg-utils/scripts/xdg-settings",
     ]
     outputs = [
       "$root_out_dir/{{source_file_part}}",
     ]
   }
 }