cc: Remove unnecessary "default" cases from switch statements.

cc/animation/transform_operation.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
+#include "base/logging.h"
 #include "cc/animation/transform_operation.h"
 #include "ui/gfx/box_f.h"
 #include "ui/gfx/vector3d_f.h"
 
 namespace {
 const double kAngleEpsilon = 1e-4;
 }
 
 namespace cc {
 
@@ skipping 267 matching lines @@
       } else if (!bounds_max.IsEmpty()) {
         UnionBoxWithZeroScale(&bounds_max);
         *bounds = bounds_max;
       }
 
       return true;
     }
     case TransformOperation::TransformOperationIdentity:
       *bounds = box;
       return true;
-    default:
+    case TransformOperation::TransformOperationRotate:
+    case TransformOperation::TransformOperationSkew:
+    case TransformOperation::TransformOperationPerspective:
+    case TransformOperation::TransformOperationMatrix:
       return false;
   }
+  NOTREACHED();
+  return false;
 }
 
 }  // namespace cc