Bug 245268

Compilation of WebKitGTK/WPE in ARM64 is failing with the following build error: ``` FAILED: Source/WebCore/CMakeFiles/WebCore.dir/platform/graphics/opengl/GraphicsContextGLOpenGLES.cpp.o <CXX> -DBUILDING_GTK__=1 -DBUILDING_WEBKIT=1 -DBUILDING_WITH_CMAKE=1 -DBUILDING_WebCore -DGETTEXT_PACKAGE=\"WebKitGTK-4.0\" -DHAVE_CONFIG_H=1 -DJSC_GLIB_API_ENABLED -DPAS_BMALLOC=1 -DSTATICALLY_LINKED_WITH_PAL -ISource/ThirdParty/libwebrtc -I../../../Source/WebCore/platform/graphics/libwpe -I. -IWebCore/DerivedSources -I../../.. ../../../Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLES.cpp:61:60: error: reference to non-static member function must be called; did you mean to call it with no arguments? ::glReadPixels(x, y, width, height, format, type, data.data); ~~~~~^~~~ () ../../../Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLES.cpp:217:34: error: reference to non-static member function must be called; did you mean to call it with no arguments? ::glGetIntegerv(pname, value.data); ~~~~~~^~~~ () ../../../Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLES.cpp:228:67: error: reference to non-static member function must be called; did you mean to call it with no arguments? ::glGetShaderPrecisionFormat(shaderType, precisionType, range.data, precision); ~~~~~~^~~~ () ../../../Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLES.cpp:233:36: error: reference to non-static member function must be called; did you mean to call it with no arguments? if (width && height && !pixels.data) { ~~~~~~~^~~~ () ../../../Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLES.cpp:238:97: error: reference to non-static member function must be called; did you mean to call it with no arguments? texImage2DDirect(target, level, internalformat, width, height, border, format, type, pixels.data); ~~~~~~~^~~~ () 5 errors generated. ``` This build error was likely introduced in 254207@main, which turned `GCGLSpan::data` attribute into member function `GCGLSpan::data()`.