[cleanup] Inline one-line CancelAndWait method

Very minor cleanup to reduce code complexity.

R=mstarzinger@chromium.org

Bug: chromium:869420
Change-Id: I53d1776792b3918d489fe002e2cb17b7a3e0ff73
Reviewed-on: https://chromium-review.googlesource.com/1158686Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54849}

src/wasm/module-compiler.cc

@@ -87,7 +87,6 @@ class CompilationState {
   void ScheduleUnitForFinishing(std::unique_ptr<WasmCompilationUnit> unit,
                                 WasmCompilationUnit::CompilationMode mode);
 
-  void CancelAndWait();
   void OnBackgroundTaskStopped();
   void RestartBackgroundTasks(size_t max = std::numeric_limits<size_t>::max());
   // Only one foreground thread (finisher) is allowed to run at a time.
@@ -154,8 +153,6 @@ class CompilationState {
   // the given {ErrorThrower} can be done at most once.
   std::vector<std::function<void(CompilationEvent, ErrorThrower*)>> callbacks_;
 
-  // When canceling the background_task_manager_, use {CancelAndWait} on
-  // the CompilationState in order to cleanly clean up.
   CancelableTaskManager background_task_manager_;
   CancelableTaskManager foreground_task_manager_;
   std::shared_ptr<v8::TaskRunner> foreground_task_runner_;
@@ -2734,7 +2731,7 @@ CompilationState::CompilationState(internal::Isolate* isolate,
 }
 
 CompilationState::~CompilationState() {
-  CancelAndWait();
+  background_task_manager_.CancelAndWait();
   foreground_task_manager_.CancelAndWait();
   NotifyOnEvent(CompilationEvent::kDestroyed, nullptr);
 }
@@ -2823,7 +2820,7 @@ void CompilationState::OnFinishedUnit() {
   --outstanding_units_;
 
   if (outstanding_units_ == 0) {
-    CancelAndWait();
+    background_task_manager_.CancelAndWait();
     baseline_compilation_finished_ = true;
 
     DCHECK(compile_mode_ == CompileMode::kRegular ||
@@ -2867,10 +2864,6 @@ void CompilationState::ScheduleUnitForFinishing(
   }
 }
 
-void CompilationState::CancelAndWait() {
-  background_task_manager_.CancelAndWait();
-}
-
 void CompilationState::OnBackgroundTaskStopped() {
   base::LockGuard<base::Mutex> guard(&mutex_);
   DCHECK_LE(1, num_background_tasks_);
@@ -2924,7 +2917,7 @@ void CompilationState::Abort() {
     base::LockGuard<base::Mutex> guard(&mutex_);
     failed_ = true;
   }
-  CancelAndWait();
+  background_task_manager_.CancelAndWait();
 }
 
 void CompilationState::NotifyOnEvent(CompilationEvent event,