D3D11: Require FL 10.1+ for ES3.

We decided some time ago to make our lives easier and raise the
lower bound on the feature level to 10.1 from 10.0. This makes
using some multisample samplers easier in HLSL. It is also a very
small and poorly suppoted fraction of our userbase.

BUG=angleproject:1381

Change-Id: I25d330a6097f71ec772899d49ff5d3a97c0cb0d2
Reviewed-on: https://chromium-review.googlesource.com/346102
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

src/libANGLE/renderer/d3d/d3d11/renderer11_utils.cpp

@@ -327,16 +327,20 @@ GLint GetMaximumClientVersion(D3D_FEATURE_LEVEL featureLevel)
 {
     switch (featureLevel)
     {
-      case D3D_FEATURE_LEVEL_11_1:
-      case D3D_FEATURE_LEVEL_11_0:
-      case D3D_FEATURE_LEVEL_10_1:
-      case D3D_FEATURE_LEVEL_10_0: return 3;
+        case D3D_FEATURE_LEVEL_11_1:
+        case D3D_FEATURE_LEVEL_11_0:
+        case D3D_FEATURE_LEVEL_10_1:
+            return 3;
 
-      case D3D_FEATURE_LEVEL_9_3:
-      case D3D_FEATURE_LEVEL_9_2:
-      case D3D_FEATURE_LEVEL_9_1:  return 2;
+        case D3D_FEATURE_LEVEL_10_0:
+        case D3D_FEATURE_LEVEL_9_3:
+        case D3D_FEATURE_LEVEL_9_2:
+        case D3D_FEATURE_LEVEL_9_1:
+            return 2;
 
-      default: UNREACHABLE();      return 0;
+        default:
+            UNREACHABLE();
+            return 0;
     }
 }