ui: Move more gfx unit tests into gfx_unittests target.

ui/ui_unittests.gyp

Index: ui/ui_unittests.gyp
diff --git a/ui/ui_unittests.gyp b/ui/ui_unittests.gyp
index be1c302810ed5c2e03840e259cc8923c20866667..75c385cb80e02c1657f01a0c32894e7e5675d7d4 100644
--- a/ui/ui_unittests.gyp
+++ b/ui/ui_unittests.gyp
@@ -71,9 +71,6 @@
         'base/text/bytes_formatting_unittest.cc',
         'base/view_prop_unittest.cc',
         'base/webui/web_ui_util_unittest.cc',
-        'gfx/animation/tween_unittest.cc',
-        'gfx/blit_unittest.cc',
-        'gfx/break_list_unittest.cc',
         'gfx/canvas_unittest.cc',
         'gfx/canvas_unittest_mac.mm',
         'gfx/codec/jpeg_codec_unittest.cc',
@@ -81,9 +78,6 @@
         'gfx/font_list_unittest.cc',
         'gfx/platform_font_mac_unittest.mm',
         'gfx/render_text_unittest.cc',
-        'gfx/sequential_id_generator_unittest.cc',
-        'gfx/transform_util_unittest.cc',
-        'gfx/utf16_indexing_unittest.cc',
       ],
       'includes': [
         'display/display_unittests.gypi',