Move SelectionBound from ui/base/touch to ui/gfx to be used by cc

ui/base/BUILD.gn

Index: ui/base/BUILD.gn
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index dae2d7ac70597dff0f089a8e5f7c27daf57a09c6..cec6accd39ff7ac9406233498d4f4cbc3a169896 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -233,8 +233,6 @@ component("base") {
     "template_expressions.h",
     "theme_provider.cc",
     "theme_provider.h",
-    "touch/selection_bound.cc",
-    "touch/selection_bound.h",
     "touch/touch_device.h",
     "touch/touch_editing_controller.cc",
     "touch/touch_editing_controller.h",
@@ -783,7 +781,6 @@ test("ui_base_unittests") {
       "models/tree_node_model_unittest.cc",
       "test/data/resource.h",
       "text/bytes_formatting_unittest.cc",
-      "touch/selection_bound_unittest.cc",
       "webui/web_ui_util_unittest.cc",
     ]
   }