Sort out build dependencies for LinuxUI.

ui/linux_ui/linux_ui.gyp

Index: ui/linux_ui/linux_ui.gyp
diff --git a/ui/native_theme/native_theme.gyp b/ui/linux_ui/linux_ui.gyp
similarity index 51%
copy from ui/native_theme/native_theme.gyp
copy to ui/linux_ui/linux_ui.gyp
index 70d27a329ee4722dac82d4e2585d268c6d220a0c..7df23b70defb7ab8f9a27eaf6e64acfcb8ea9abb 100644
--- a/ui/native_theme/native_theme.gyp
+++ b/ui/linux_ui/linux_ui.gyp
@@ -8,7 +8,7 @@
   },
   'targets': [
     {
-      'target_name': 'native_theme',
+      'target_name': 'linux_ui',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
@@ -16,27 +16,15 @@
         '../../skia/skia.gyp:skia',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
+        '../native_theme/native_theme.gyp:native_theme',
       ],
       'defines': [
-        'NATIVE_THEME_IMPLEMENTATION',
+        'LINUX_UI_IMPLEMENTATION',
       ],
       'sources': [
-        'common_theme.cc',
-        'common_theme.h',
-        'native_theme.cc',
-        'native_theme.h',
-        'native_theme_android.cc',
-        'native_theme_android.h',
-        'native_theme_aura.cc',
-        'native_theme_aura.h',
-        'native_theme_base.cc',
-        'native_theme_base.h',
-        'native_theme_gtk.cc',
-        'native_theme_gtk.h',
-        'native_theme_mac.h',
-        'native_theme_mac.mm',
-        'native_theme_win.cc',
-        'native_theme_win.h',
+        'linux_ui.cc',
+        'linux_ui.h',
+        'linux_ui_export.h',
       ],
     },
   ],