Fix many warnings/errors when building Observatory

runtime/observatory/lib/src/repositories/sample_profile.dart

Index: runtime/observatory/lib/src/repositories/sample_profile.dart
diff --git a/runtime/observatory/lib/src/repositories/sample_profile.dart b/runtime/observatory/lib/src/repositories/sample_profile.dart
index f98e0159d8b02f5003ebc86ce28cc4610dfc7612..02d0f609d40d650055347d7e8a3770a9651c51d6 100644
--- a/runtime/observatory/lib/src/repositories/sample_profile.dart
+++ b/runtime/observatory/lib/src/repositories/sample_profile.dart
@@ -32,7 +32,7 @@ class SampleProfileLoadingProgress extends M.SampleProfileLoadingProgress {
   Stream<SampleProfileLoadingProgressEvent> get onProgress =>
       _onProgress.stream;
 
-  final ServiceObjectOwner owner;
+  final M.ServiceObjectOwner owner;
   final S.Class cls;
   final M.SampleProfileTag tag;
   final bool clear;
@@ -174,7 +174,7 @@ class NativeMemorySampleProfileRepository
   SampleProfileLoadingProgress _last;
 
   Stream<SampleProfileLoadingProgressEvent> get(M.VM vm, M.SampleProfileTag t,
-      {bool forceFetch: false}) {
+      {bool forceFetch: false, bool clear: false}) {
     assert(forceFetch != null);
     if ((_last != null) && !forceFetch) {
       _last.reuse();