webaudio: Remove BaseAudioContext::connection_count_.

Part of reducing the differences between the AudioNode connect/disconnect
variants.

Bug: 856641
Change-Id: I51cab0acd1b6ae8463dedd3b02b30e3b80dabbc7
Reviewed-on: https://chromium-review.googlesource.com/1126411Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Raymond Toy <rtoy@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573424}

third_party/blink/renderer/modules/webaudio/audio_node.cc

@@ -730,9 +730,6 @@ AudioNode* AudioNode::connect(AudioNode* destination,
     connected_nodes_[output_index] = new HeapHashSet<Member<AudioNode>>();
   connected_nodes_[output_index]->insert(destination);
 
-  // Let context know that a connection has been made.
-  context()->IncrementConnectionCount();
-
   return destination;
 }
 

third_party/blink/renderer/modules/webaudio/base_audio_context.cc

@@ -93,7 +93,6 @@ BaseAudioContext::BaseAudioContext(Document* document,
       is_cleared_(false),
       is_resolving_resume_promises_(false),
       has_posted_cleanup_task_(false),
-      connection_count_(0),
       deferred_task_handler_(DeferredTaskHandler::Create()),
       context_state_(kSuspended),
       periodic_wave_sine_(nullptr),

third_party/blink/renderer/modules/webaudio/base_audio_context.h

@@ -251,14 +251,6 @@ class MODULES_EXPORT BaseAudioContext
   // Called at the end of each render quantum.
   void HandlePostRenderTasks();
 
-  // Keeps track of the number of connections made.
-  void IncrementConnectionCount() {
-    DCHECK(IsMainThread());
-    connection_count_++;
-  }
-
-  unsigned ConnectionCount() const { return connection_count_; }
-
   DeferredTaskHandler& GetDeferredTaskHandler() const {
     return *deferred_task_handler_;
   }
@@ -421,8 +413,6 @@ class MODULES_EXPORT BaseAudioContext
   // thread. Cleared by the main thread task once it has run.
   bool has_posted_cleanup_task_;
 
-  unsigned connection_count_;
-
   // Graph locking.
   scoped_refptr<DeferredTaskHandler> deferred_task_handler_;