Remove all uses of "actual" formats.

BUG=angle:861

Change-Id: I7cd2d1a56772fdf18bcf926456399322d13e7a4f
Reviewed-on: https://chromium-review.googlesource.com/236305
Reviewed-by: Brandon Jones <bajones@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/State.cpp b/src/libANGLE/State.cpp
index bd031b2..4850968 100644
--- a/src/libANGLE/State.cpp
+++ b/src/libANGLE/State.cpp
@@ -273,13 +273,10 @@
 
     if (mask & GL_STENCIL_BUFFER_BIT)
     {
-        if (framebufferObject->getStencilbuffer() != NULL)
+        if (framebufferObject->getStencilbuffer() != NULL &&
+            framebufferObject->getStencilbuffer()->getStencilSize() > 0)
         {
-            GLenum stencilActualFormat = framebufferObject->getStencilbuffer()->getActualFormat();
-            if (GetInternalFormatInfo(stencilActualFormat).stencilBits > 0)
-            {
-                clearParams.clearStencil = true;
-            }
+            clearParams.clearStencil = true;
         }
     }