Switch usage of _DEBUG macro to NDEBUG.

webrtc/base/sigslot.h

Index: webrtc/base/sigslot.h
diff --git a/webrtc/base/sigslot.h b/webrtc/base/sigslot.h
index d9b12b04bc77ecd7745eaa30daba37fadb6809d5..a5fd5f79af29a47cbfe8f7b9e12193fb86412f46 100644
--- a/webrtc/base/sigslot.h
+++ b/webrtc/base/sigslot.h
@@ -532,7 +532,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -686,7 +686,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -825,7 +825,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -963,7 +963,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -1101,7 +1101,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -1241,7 +1241,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -1381,7 +1381,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -1521,7 +1521,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);
@@ -1662,7 +1662,7 @@ namespace sigslot {
 			m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
 		}
 
-#ifdef _DEBUG
+#if !defined(NDEBUG)
 			bool connected(has_slots_interface* pclass)
 		{
 			lock_block<mt_policy> lock(this);