Remove extra vertical white space.

runtime/include/dart_api.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 INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 1305 matching lines @@
  */
 DART_EXPORT Dart_Handle Dart_DoubleValue(Dart_Handle double_obj, double* value);
 
 // --- Strings ---
 
 /**
  * Is this object a String?
  */
 DART_EXPORT bool Dart_IsString(Dart_Handle object);
 
-
 /**
  * Is this object an ASCII String?
  */
 DART_EXPORT bool Dart_IsAsciiString(Dart_Handle object);
 
-
 /**
  * Gets the length of a String.
  *
  * \param str A String.
  * \param length Returns the length of the String.
  *
  * \return A valid handle if no error occurs during the operation.
  */
 DART_EXPORT Dart_Handle Dart_StringLength(Dart_Handle str, intptr_t* length);
 
@@ skipping 1374 matching lines @@
  *
  * \param object An object.
  * \param peer A value to store in the peer field.
  *
  * \return Returns an error if 'object' is a subtype of Null, num, or
  *   bool.
  */
 DART_EXPORT Dart_Handle Dart_SetPeer(Dart_Handle object, void* peer);
 
 #endif  // INCLUDE_DART_API_H_