Revert "egl: Use khronos version of __APPLE__ section in eglplatform.h"

This reverts commit 6c1f5306.

Reason for revert:
Speculative revert for build failures on the Mac bot
https://build.chromium.org/p/chromium/builders/Mac/builds/33456

Original change's description:
> egl: Use khronos version of __APPLE__ section in eglplatform.h
> 
> Bug: 769415
> Change-Id: I8e16a2a35286144eaa2d97b4d5f7cf239a00a8e5
> Reviewed-on: https://chromium-review.googlesource.com/703739
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: Brian Anderson <brianderson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#506957}

TBR=brianderson@chromium.org,kbr@chromium.org,cwallez@chromium.org

Change-Id: Ia96b247a9080be24a8c53dca6a7033aed43eb40f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 769415
Reviewed-on: https://chromium-review.googlesource.com/704334Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506958}

third_party/khronos/EGL/eglplatform.h

@@ -77,7 +77,7 @@ typedef HDC     EGLNativeDisplayType;
 typedef HBITMAP EGLNativePixmapType;
 typedef HWND    EGLNativeWindowType;
 
-#elif defined(__APPLE__) || defined(__WINSCW__) || defined(__SYMBIAN32__)  /* Symbian */
+#elif defined(__WINSCW__) || defined(__SYMBIAN32__)
 
 typedef int   EGLNativeDisplayType;
 typedef void *EGLNativeWindowType;
@@ -109,6 +109,19 @@ typedef Display *EGLNativeDisplayType;
 typedef Pixmap   EGLNativePixmapType;
 typedef Window   EGLNativeWindowType;
 
+#elif defined(__APPLE__)
+
+/* Chromium-specific __APPLE__ EGLNative* definition */
+typedef void          *EGLNativeDisplayType;
+typedef int            EGLNativePixmapType;
+#ifdef __OBJC__
+@class NSView;
+typedef NSView *EGLNativeWindowType;
+#else
+struct NSView;
+typedef struct NSView *EGLNativeWindowType;
+#endif  // __OBJC__
+
 #else
 #error "Platform not recognized"
 #endif