Disable auto "debugger" call for tests

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
index a60442374be6d026ed6179cf11abf53357ff720a..913107e0e48628a8026af6ee3120ea2979f8cef1 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/utils.dart
@@ -24,13 +24,13 @@ final hasOwnProperty = JS('', 'Object.prototype.hasOwnProperty');
 /// This error indicates a strong mode specific failure, other than a type
 /// assertion failure (TypeError) or CastError.
 void throwStrongModeError(String message) {
-  JS('', 'debugger');
+  if (_trapRuntimeErrors) JS('', 'debugger');
   JS('', 'throw new #(#);', StrongModeErrorImplementation, message);
 }
 
 /// This error indicates a bug in the runtime or the compiler.
 void throwInternalError(String message) {
-  JS('', 'debugger');
+  if (_trapRuntimeErrors) JS('', 'debugger');
   JS('', 'throw Error(#)', message);
 }