Bug 1765195 - Remove unused ICRData. r=gfx-reviewers,lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D143935

dom/canvas/WebGLContext.h

@@ -467,8 +467,6 @@ class WebGLContext : public VRefCounted, public SupportsWeakPtr {
 
   WebGLTexture* GetActiveTex(const GLenum texTarget) const;
 
-  Maybe<ICRData> InitializeCanvasRenderer(layers::LayersBackend backend);
-
   gl::GLContext* GL() const { return gl; }
 
   bool IsPremultAlpha() const { return mOptions.premultipliedAlpha; }

dom/canvas/WebGLQueueParamTraits.h

@@ -50,9 +50,6 @@ template <>
 struct IsTriviallySerializable<mozilla::webgl::PixelUnpackStateWebgl>
     : std::true_type {};
 
-template <>
-struct IsTriviallySerializable<ICRData> : std::true_type {};
-
 template <>
 struct IsTriviallySerializable<gfx::IntSize> : std::true_type {};
 

dom/canvas/WebGLTypes.h

@@ -753,13 +753,6 @@ struct VertAttribPointerCalculated final {
 
 }  // namespace webgl
 
-// return value for the InitializeCanvasRenderer message
-struct ICRData {
-  gfx::IntSize size;
-  bool hasAlpha;
-  bool isPremultAlpha;
-};
-
 /**
  * Represents a block of memory that it may or may not own.  The
  * inner data type must be trivially copyable by memcpy.