Fixed all unused-variable Clang warnings on Windows.

chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc

Index: chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
diff --git a/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc b/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
index 12360aa5c735bb416218238dca66256b2f01f50f..3a3eaa66ea59aa1d0f6f1a00cf8d039eea288a2e 100644
--- a/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
+++ b/chrome/browser/extensions/api/gcd_private/gcd_private_apitest.cc
@@ -144,6 +144,7 @@ const uint8 kGoodbyePacket[] = {
     'o',  'c',  'a',  'l',  0x00,
 };
 
+#if !defined(OS_WIN) || defined(NDEBUG)
 const uint8 kQueryPacket[] = {
     // Header
     0x00, 0x00,  // ID is zeroed out
@@ -159,6 +160,7 @@ const uint8 kQueryPacket[] = {
     'p',  0x05, 'l', 'o', 'c', 'a', 'l', 0x00, 0x00, 0x0c,  // TYPE is PTR.
     0x00, 0x01,                                             // CLASS is IN.
 };
+#endif  // !defined(OS_WIN) || defined(NDEBUG)
 
 #endif  // ENABLE_MDNS