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

cc/output/render_surface_filters.cc

Index: cc/output/render_surface_filters.cc
diff --git a/cc/output/render_surface_filters.cc b/cc/output/render_surface_filters.cc
index fa84e67f4d3913dd66ef067eb55d72e031c6cd20..6df8d3793f7d723c191d612297a8efc7eead570f 100644
--- a/cc/output/render_surface_filters.cc
+++ b/cc/output/render_surface_filters.cc
@@ -226,9 +226,13 @@ bool GetColorMatrix(const FilterOperation& op, SkScalar matrix[20]) {
       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 {