[Ozone] Remove unnecessary cast to EGLNativeDisplayType

https://codereview.chromium.org/184433003/ adds the khronos headers as the first headers to be used by EGL. Since we have Ozone platform typedefs in the khronos headers the cast is not necessary.

TBR=piman@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/192823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255992 0039d316-1c4b-4281-b951-d872f2087c98

ui/gl/gl_surface_egl.cc

@@ -142,8 +142,7 @@ bool GLSurfaceEGL::InitializeOneOff() {
     LOG(ERROR) << "OZONE failed to initialize hardware";
     return false;
   }
-  g_native_display = reinterpret_cast<EGLNativeDisplayType>(
-      surface_factory->GetNativeDisplay());
+  g_native_display = surface_factory->GetNativeDisplay();
 #else
   g_native_display = EGL_DEFAULT_DISPLAY;
 #endif