Make sure the close (X) on the Cocoa tab is white when highlighted.

Bug: 839534
Change-Id: I7242753e5777b15168ba8a0ff91a000a8a16c980
Reviewed-on: https://chromium-review.googlesource.com/1042624Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555885}

chrome/browser/ui/cocoa/hover_close_button.mm

@@ -172,8 +172,9 @@ const SkColor kDefaultIconColor = SkColorSetARGB(0xA0, 0x00, 0x00, 0x00);
       break;
   }
 
-  const gfx::ImageSkia& iconImage = gfx::CreateVectorIcon(
-      kTabCloseNormalIcon, kTabCloseButtonSize, iconColor_);
+  const gfx::ImageSkia& iconImage =
+      gfx::CreateVectorIcon(kTabCloseNormalIcon, kTabCloseButtonSize,
+                            vectorHighlightIcon ? SK_ColorWHITE : iconColor_);
 
   if (vectorHighlightIcon) {
     const gfx::ImageSkia& highlight = gfx::CreateVectorIcon(