Make unit_tests compile in Mac GN

chrome/common/BUILD.gn

Index: chrome/common/BUILD.gn
diff --git a/chrome/common/BUILD.gn b/chrome/common/BUILD.gn
index 97019946ded0b3feb11af9fb07f07db8d00bccde..42b1d8fe9420637dcf9ce65e18a4008f515ed686 100644
--- a/chrome/common/BUILD.gn
+++ b/chrome/common/BUILD.gn
@@ -139,9 +139,6 @@ static_library("common") {
       "//extensions:extensions_resources",
       "//extensions/strings",
       "//media/cast:net",
-
-      # This dependency is for a header used only by extensions code.
-      "//ui/keyboard:keyboard_with_content",
     ]
     if (is_chromeos) {
       sources +=
@@ -149,6 +146,10 @@ static_library("common") {
                       ".",
                       "//chrome")
     }
+    if (use_aura) {
+      # This dependency is for a header used only by extensions code.
+      public_deps += [ "//ui/keyboard:keyboard_with_content" ]
+    }
   }
 
   if (is_win || is_mac) {