Aura does not need to depend on gpu target.

ui/aura/aura.gyp

Index: ui/aura/aura.gyp
diff --git a/ui/aura/aura.gyp b/ui/aura/aura.gyp
index bb91ea79b361c2425f80ff61a4b245cbbbc923ff..29dce96a649231f867202428d7de563ba47bfbb8 100644
--- a/ui/aura/aura.gyp
+++ b/ui/aura/aura.gyp
@@ -14,7 +14,6 @@
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
-        '../../gpu/gpu.gyp:gpu',
         '../../skia/skia.gyp:skia',
         '../base/ui_base.gyp:ui_base',
         '../compositor/compositor.gyp:compositor',
@@ -62,7 +61,7 @@
         'input_state_lookup_win.h',
         'layout_manager.cc',
         'layout_manager.h',
-        'remote_window_tree_host_win.cc',	
+        'remote_window_tree_host_win.cc',
         'remote_window_tree_host_win.h',
         'scoped_window_targeter.cc',
         'scoped_window_targeter.h',
@@ -226,6 +225,7 @@
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../cc/cc.gyp:cc',
+        '../../gpu/gpu.gyp:gles2_implementation',
         '../../skia/skia.gyp:skia',
         '../../third_party/icu/icu.gyp:icui18n',
         '../../third_party/icu/icu.gyp:icuuc',