Remove the GLES2_USE_MOJO macro.

mojo/public/c/gpu/GLES2/gl2mojo_internal.h

Index: mojo/public/c/gpu/GLES2/gl2mojo_internal.h
diff --git a/mojo/public/c/gpu/GLES2/gl2mojo_internal.h b/mojo/public/c/gpu/GLES2/gl2mojo_internal.h
index 081d7378b51e26a8b7b372fa6fb4bb2bc9cb2eb0..32bc3b1f09c933a91b1d1089b2ce735613c94098 100644
--- a/mojo/public/c/gpu/GLES2/gl2mojo_internal.h
+++ b/mojo/public/c/gpu/GLES2/gl2mojo_internal.h
@@ -15,17 +15,7 @@
 #define GL_PATH_MODELVIEW_MATRIX_CHROMIUM 0x0BA6
 #define GL_PATH_PROJECTION_MATRIX_CHROMIUM 0x0BA7
 
-#if defined(GLES2_USE_MOJO)
 #define GLES2_GET_FUN(name) MojoGLES2gl##name
-#else
-// Because we are using both the real system GL and our own
-// emulated GL we need to use different names to avoid conflicts.
-#if defined(GLES2_USE_CPP_BINDINGS)
-#define GLES2_GET_FUN(name) gles2::GetGLContext()->name
-#else
-#define GLES2_GET_FUN(name) GLES2##name
-#endif
-#endif
 
 #include <GLES2/gl2mojo_autogen.h>