Simplify the desugaring of catch clauses.

runtime/vm/scopes.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_SCOPES_H_
 #define VM_SCOPES_H_
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/allocation.h"
@@ skipping 269 matching lines @@
   // We mark a variable as 'captured' when applicable.
   LocalVariable* LookupVariable(const String& name, bool test_only);
 
   // Lookup a label in this scope and its parents.
   SourceLabel* LookupLabel(const String& name);
 
   // Lookup the "innermost" label that labels a for, while, do, or switch
   // statement.
   SourceLabel* LookupInnermostLabel(Token::Kind jump_kind);
 
-  // Lookup the label for the "innermost" catch block if one exists.
-  SourceLabel* LookupInnermostCatchLabel();
-
   // Lookup scope of outer switch statement at same function level.
   // Returns NULL if this scope is not embedded in a switch.
   LocalScope* LookupSwitchScope();
 
   // Looks up variable in this scope and mark as captured if applicable.
   // Finds the variable even if it is marked invisible. Returns true if
   // the variable was found, false if it was not found.
   bool CaptureVariable(const String& name);
 
   // Look for unresolved forward references to labels in this scope.
@@ skipping 85 matching lines @@
   // List of names referenced in this scope and its children that
   // are not resolved to local variables.
   GrowableArray<NameReference*> referenced_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_SCOPES_H_