Reland: Implement Aura side of unified touch text selection for contents

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 81823f02c46c6202d9e63ca4f2cf4f7f7ff2d51b..f8d9a2ec20aa3ea4ab1e59280adde1075b98d173 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -314,11 +314,6 @@ if (!is_mac) {
 
     data_deps = []
 
-    if (!is_chromeos) {
-      sources -=
-          [ "../browser/web_contents/touch_editable_impl_aura_browsertest.cc" ]
-    }
-
     if (is_win) {
       sources += rebase_path(
               content_tests_gypi_values.content_browsertests_win_sources,