Combine es2::Image and es1::Image into egl::Image.

Change-Id: Iadd4ce8ac36ad3458741f244423731fa00d7fd84
Reviewed-on: https://swiftshader-review.googlesource.com/2982
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
diff --git a/src/OpenGL/libGLESv2/Renderbuffer.cpp b/src/OpenGL/libGLESv2/Renderbuffer.cpp
index 38f4189..2ae4435 100644
--- a/src/OpenGL/libGLESv2/Renderbuffer.cpp
+++ b/src/OpenGL/libGLESv2/Renderbuffer.cpp
@@ -228,7 +228,7 @@
 
 // Increments refcount on image.
 // caller must release() the returned image
-Image *RenderbufferTextureCubeMap::getRenderTarget()
+egl::Image *RenderbufferTextureCubeMap::getRenderTarget()
 {
 	return mTextureCubeMap->getRenderTarget(mTarget, 0);
 }