WebGLTextureUtils: Remove flag.

Author: Mugen87

src/renderers/webgl-fallback/utils/WebGLTextureUtils.js

@@ -409,8 +409,7 @@ class WebGLTextureUtils {
 
 		backend.set( texture, {
 			textureGPU,
-			glTextureType,
-			isDefault: true
+			glTextureType
 		} );
 
 	}
@@ -741,20 +740,14 @@ class WebGLTextureUtils {
 	 * Destroys the GPU data for the given texture object.
 	 *
 	 * @param {Texture} texture - The texture.
-	 * @param {boolean} [isDefaultTexture=false] - Whether the texture uses a default GPU texture or not.
 	 */
-	destroyTexture( texture, isDefaultTexture = false ) {
+	destroyTexture( texture ) {
 
 		const { gl, backend } = this;
 		const { textureGPU, renderTarget } = backend.get( texture );
 
 		this.deallocateRenderBuffers( renderTarget );
-
-		if ( isDefaultTexture === false ) {
-
-			gl.deleteTexture( textureGPU );
-
-		}
+		gl.deleteTexture( textureGPU );
 
 		backend.delete( texture );