Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/base/taskrunner.h

Index: webrtc/base/taskrunner.h
diff --git a/webrtc/base/taskrunner.h b/webrtc/base/taskrunner.h
index bd7b4ea858b485aa6824d4a2fc45570245351564..4832e5a64a69141b97c5342694702bdbc6c1855d 100644
--- a/webrtc/base/taskrunner.h
+++ b/webrtc/base/taskrunner.h
@@ -15,6 +15,7 @@
 
 #include <vector>
 
+#include "webrtc/base/checks.h"
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/taskparent.h"
 
@@ -45,7 +46,7 @@ class TaskRunner : public TaskParent, public sigslot::has_slots<> {
 
   void UpdateTaskTimeout(Task* task, int64_t previous_task_timeout_time);
 
-#if !defined(NDEBUG)
+#if RTC_DCHECK_IS_ON
   bool is_ok_to_delete(Task* task) {
     return task == deleting_task_;
   }
@@ -88,7 +89,7 @@ class TaskRunner : public TaskParent, public sigslot::has_slots<> {
   std::vector<Task *> tasks_;
   Task *next_timeout_task_;
   bool tasks_running_;
-#if !defined(NDEBUG)
+#if RTC_DCHECK_IS_ON
   int abort_count_;
   Task* deleting_task_;
 #endif