[Autofill] Fix border color for Mac.

The condition was not quite right, as Mac uses a Cocoa implementation
and views in other places.

Bug: None
Change-Id: I6102b5185cc55c394d3710a7dd0fe0b69c599a9d
Reviewed-on: https://chromium-review.googlesource.com/565070Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485372}

chrome/browser/ui/autofill/popup_constants.h

@@ -9,12 +9,12 @@
 
 namespace autofill {
 
-#if defined(TOOLKIT_VIEWS)
-// In views, the implementation takes care of the border itself.
-const int kPopupBorderThickness = 0;
-#else
+#if defined(OS_MACOSX) || defined(OS_ANDROID)
 // TODO(crbug.com/676221): Change this to pixels
 const int kPopupBorderThickness = 1;
+#else
+// In views, the implementation takes care of the border itself.
+const int kPopupBorderThickness = 0;
 #endif
 
 }  // namespace autofill