Remove dart_debugger_api.h

BUG=
R=asiva@google.com

Review URL: https://codereview.chromium.org//1190103003.
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index bb01402..bd5e877 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -7,7 +7,7 @@
 #include <stdio.h>
 
 #include "include/dart_api.h"
-#include "include/dart_debugger_api.h"
+#include "include/dart_tools_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"