memory-infra: Move dump level check to observer and rename session state

base/trace_event/memory_dump_session_state.cc

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/trace_event/memory_dump_session_state.h"
-
-namespace base {
-namespace trace_event {
-
-MemoryDumpSessionState::MemoryDumpSessionState()
-    : heap_profiler_breakdown_threshold_bytes_(0) {}
-MemoryDumpSessionState::~MemoryDumpSessionState() {}
-
-void MemoryDumpSessionState::SetStackFrameDeduplicator(
-    std::unique_ptr<StackFrameDeduplicator> stack_frame_deduplicator) {
-  DCHECK(!stack_frame_deduplicator_);
-  stack_frame_deduplicator_ = std::move(stack_frame_deduplicator);
-}
-
-void MemoryDumpSessionState::SetTypeNameDeduplicator(
-    std::unique_ptr<TypeNameDeduplicator> type_name_deduplicator) {
-  DCHECK(!type_name_deduplicator_);
-  type_name_deduplicator_ = std::move(type_name_deduplicator);
-}
-
-void MemoryDumpSessionState::SetAllowedDumpModes(
-    std::set<MemoryDumpLevelOfDetail> allowed_dump_modes) {
-  allowed_dump_modes_ = allowed_dump_modes;
-}
-
-bool MemoryDumpSessionState::IsDumpModeAllowed(
-    MemoryDumpLevelOfDetail dump_mode) const {
-  return allowed_dump_modes_.count(dump_mode) != 0;
-}
-
-}  // namespace trace_event
-}  // namespace base