Fix dictionary look-up for highlighted text in Mac.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index 06a721d0a3e8e67e0f60b38d5864587bbc9e9c32..ea55d92baf0b61458f0f30b96cefff4969742ff0 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -364,6 +364,7 @@ static_library("test_support") {
   }
 
   if (is_mac) {
+    sources += [ "../public/test/text_input_test_utils_mac.mm" ]

[Avi (use Gerrit), 2016/10/07 21:11:26]

I think you can put this into the normal sources section, and it will
automatically be filtered out if we're not on the Mac.

[EhsanK, 2016/10/11 19:31:56]

Acknowledged.

     deps += [ "//ui/accelerated_widget_mac" ]
   }
 }