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

cc/output/render_surface_filters.cc

 // Copyright 2012 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 "cc/output/render_surface_filters.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "cc/output/filter_operation.h"
@@ skipping 208 matching lines @@
       return true;
     }
     case FilterOperation::OPACITY: {
       GetOpacityMatrix(op.amount(), matrix);
       return true;
     }
     case FilterOperation::COLOR_MATRIX: {
       memcpy(matrix, op.matrix(), sizeof(SkScalar[20]));
       return true;
     }
-    default:
-      return false;
+    case FilterOperation::BLUR:
+    case FilterOperation::DROP_SHADOW:
+    case FilterOperation::ZOOM: {
+      break;
+    }
   }
+  return false;
 }
 
 class FilterBufferState {
  public:
   FilterBufferState(GrContext* gr_context,
                     gfx::SizeF size,
                     unsigned texture_id)
       : gr_context_(gr_context),
         current_texture_(0) {
     // Wrap the source texture in a Ganesh platform texture.
@@ skipping 211 matching lines @@
       case FilterOperation::OPACITY:
         NOTREACHED();
         break;
     }
     state.Swap();
   }
   return state.Source();
 }
 
 }  // namespace cc