Remove unused trace sampling states

sky/viewer/platform/platform_impl.cc

Index: sky/viewer/platform/platform_impl.cc
diff --git a/sky/viewer/platform/platform_impl.cc b/sky/viewer/platform/platform_impl.cc
index 5674e54f57d11c16f4ab029fa50ffd6de5c40401..35b20ed7d0aa4a105dd44c6b3ad21b84f7ce72dd 100644
--- a/sky/viewer/platform/platform_impl.cc
+++ b/sky/viewer/platform/platform_impl.cc
@@ -128,20 +128,6 @@ const unsigned char* PlatformImpl::getTraceCategoryEnabledFlag(
   return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
 }
 
-long* PlatformImpl::getTraceSamplingState(const unsigned thread_bucket) {
-  switch (thread_bucket) {
-    case 0:
-      return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(0));
-    case 1:
-      return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(1));
-    case 2:
-      return reinterpret_cast<long*>(&TRACE_EVENT_API_THREAD_BUCKET(2));
-    default:
-      NOTREACHED() << "Unknown thread bucket type.";
-  }
-  return NULL;
-}
-
 COMPILE_ASSERT(
     sizeof(blink::Platform::TraceEventHandle) ==
         sizeof(base::debug::TraceEventHandle),