Revert "Revert "Remove non-const FBO attachment queries.""

Fixed build errors in prior patch.

This reverts commit 34771622d756adc52f02becd7c2b70c717dcc638.

Change-Id: I909b455f2c632a3df7d97149972e167c2adb058f
Reviewed-on: https://chromium-review.googlesource.com/267599
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/State.cpp b/src/libANGLE/State.cpp
index 6b9f37e..e5eb018 100644
--- a/src/libANGLE/State.cpp
+++ b/src/libANGLE/State.cpp
@@ -1286,8 +1286,8 @@
         break;
       case GL_DEPTH_BITS:
         {
-            gl::Framebuffer *framebuffer = getDrawFramebuffer();
-            gl::FramebufferAttachment *depthbuffer = framebuffer->getDepthbuffer();
+            const gl::Framebuffer *framebuffer = getDrawFramebuffer();
+            const gl::FramebufferAttachment *depthbuffer = framebuffer->getDepthbuffer();
 
             if (depthbuffer)
             {
@@ -1301,8 +1301,8 @@
         break;
       case GL_STENCIL_BITS:
         {
-            gl::Framebuffer *framebuffer = getDrawFramebuffer();
-            gl::FramebufferAttachment *stencilbuffer = framebuffer->getStencilbuffer();
+            const gl::Framebuffer *framebuffer = getDrawFramebuffer();
+            const gl::FramebufferAttachment *stencilbuffer = framebuffer->getStencilbuffer();
 
             if (stencilbuffer)
             {