Aura does not need to depend on gpu target.

A grep for gpu reveals that only ui/aura/bench includes from gpu.

Change aura_bench to depend on gles2_implementation.

That should simplify the conversion of Aura to GN.

BUG=None
TEST=green trybots
TBR=ben@chromium.org,brettw@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/308043007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274087 0039d316-1c4b-4281-b951-d872f2087c98

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',
@@ -227,6 +226,7 @@
         '../../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',