Fixed all unused-variable Clang warnings on Windows.

chrome/browser/ui/browser_focus_uitest.cc

Index: chrome/browser/ui/browser_focus_uitest.cc
diff --git a/chrome/browser/ui/browser_focus_uitest.cc b/chrome/browser/ui/browser_focus_uitest.cc
index e5ea8904f3659eaad4265be2dcc8cfc1f14b9781..b063b87455af01a1b0c7c5077fe187d8042036b7 100644
--- a/chrome/browser/ui/browser_focus_uitest.cc
+++ b/chrome/browser/ui/browser_focus_uitest.cc
@@ -55,9 +55,11 @@ using content::WebContents;
 
 namespace {
 
+#if defined(OS_POSIX)
 // The delay waited in some cases where we don't have a notifications for an
 // action we take.
 const int kActionDelayMs = 500;
+#endif
 
 const char kSimplePage[] = "/focus/page_with_focus.html";
 const char kStealFocusPage[] = "/focus/page_steals_focus.html";