Remove WebGLObject maps from WebGLRenderingContextBase and WebGLContextGroup.

third_party/WebKit/Source/modules/webgl/WebGLContextObject.h

Index: third_party/WebKit/Source/modules/webgl/WebGLContextObject.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLContextObject.h b/third_party/WebKit/Source/modules/webgl/WebGLContextObject.h
index 1bcfc38322704d93d8c14a7acce6395897ecd6c0..a045a5958a116373ef76047d0ad1b728cead0e38 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLContextObject.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLContextObject.h
@@ -36,8 +36,6 @@ class WebGLRenderingContextBase;
 // WebGLRenderingContextBase.
 class WebGLContextObject : public WebGLObject {
  public:
-  ~WebGLContextObject() override;
-
   WebGLRenderingContextBase* context() const { return m_context; }
 
   bool validate(const WebGLContextGroup*,
@@ -45,8 +43,6 @@ class WebGLContextObject : public WebGLObject {
     return context == m_context;

[Zhenyao Mo, 2016/12/02 18:58:39]

Do we also want to check the numberOfContextLosses here?

[Ken Russell (switch to Gerrit), 2016/12/02 22:13:38]

Sorry, forgot to reply to your comment. Yes, thank you for catching this; that
was a bug. Fixed. (Surprising that the WEBGL_lose_context extension test didn't
catch this -- I'll look into improving it.)

   }
 
-  void detachContext();
-
   DECLARE_VIRTUAL_TRACE();
 
  protected:
@@ -54,6 +50,8 @@ class WebGLContextObject : public WebGLObject {
 
   bool hasGroupOrContext() const final { return m_context; }
 
+  uint32_t currentNumberOfContextLosses() const final;
+
   gpu::gles2::GLES2Interface* getAGLInterface() const final;
 
  private: