Stack sampling profiler: handle unloaded and unloading modules

base/profiler/native_stack_sampler_posix.cc

Index: base/profiler/native_stack_sampler_posix.cc
diff --git a/base/profiler/native_stack_sampler_posix.cc b/base/profiler/native_stack_sampler_posix.cc
index bce37e10c3af76d27be11cb97b2ea5b343ef020d..c67d8857a572172fe904ebb8b8afd183f8c0c9bb 100644
--- a/base/profiler/native_stack_sampler_posix.cc
+++ b/base/profiler/native_stack_sampler_posix.cc
@@ -7,7 +7,8 @@
 namespace base {
 
 scoped_ptr<NativeStackSampler> NativeStackSampler::Create(
-    PlatformThreadId thread_id) {
+    PlatformThreadId thread_id,
+    NativeStackSamplerTestDelegate* test_delegate) {
   return scoped_ptr<NativeStackSampler>();
 }