app: Trim down the dependency list of app_base.

app/app_base.gypi

Index: app/app_base.gypi
diff --git a/app/app_base.gypi b/app/app_base.gypi
index b12f27e8987fb6721955c9fa841e71219af55a32..7dfe4772ddef1c82650c60da2498214ca6220ced 100644
--- a/app/app_base.gypi
+++ b/app/app_base.gypi
@@ -3,25 +3,16 @@
 # found in the LICENSE file.
 
 {
+  'variables': {
+    'chromium_code': 1,
+  },
   'targets': [
     {
       'target_name': 'app_base',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
-        '../base/base.gyp:base_static',
-        '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
-        '../build/temp_gyp/googleurl.gyp:googleurl',
-        '../skia/skia.gyp:skia',
-        '../third_party/libpng/libpng.gyp:libpng',
         '../third_party/sqlite/sqlite.gyp:sqlite',
-        '../third_party/zlib/zlib.gyp:zlib',
-        '../ui/ui.gyp:ui_gfx',
-        '<(libjpeg_gyp_path):libjpeg',
-      ],
-      'export_dependent_settings': [
-        '../base/base.gyp:base',
-        '../base/base.gyp:base_static',
       ],
       'sources': [
         'sql/connection.cc',