[PPAPI] Fix a bunch of spelling mistakes

ppapi/cpp/dev/var_dictionary_dev.h

 // Copyright (c) 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.
 
 #ifndef PPAPI_CPP_DEV_VAR_DICTIONARY_DEV_H_
 #define PPAPI_CPP_DEV_VAR_DICTIONARY_DEV_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/cpp/dev/var_array_dev.h"
 #include "ppapi/cpp/var.h"
 
 /// @file
 /// This file defines the API for interacting with dictionary vars.
 
 namespace pp {
 
 class VarDictionary_Dev : public Var {
  public:
   /// Constructs a new dictionary var.
   VarDictionary_Dev();
 
-  /// Contructs a <code>VarDictionary_Dev</code> given a var for which
+  /// Constructs a <code>VarDictionary_Dev</code> given a var for which
   /// is_dictionary() is true. This will refer to the same dictionary var, but
   /// allow you to access methods specific to dictionary.
   ///
   /// @param[in] var A dictionary var.
   explicit VarDictionary_Dev(const Var& var);
 
-  /// Contructs a <code>VarDictionary_Dev</code> given a <code>PP_Var</code>
+  /// Constructs a <code>VarDictionary_Dev</code> given a <code>PP_Var</code>
   /// of type PP_VARTYPE_DICTIONARY.
   ///
   /// @param[in] var A <code>PP_Var</code> of type PP_VARTYPE_DICTIONARY.
   explicit VarDictionary_Dev(const PP_Var& var);
 
   /// Copy constructor.
   VarDictionary_Dev(const VarDictionary_Dev& other);
 
   virtual ~VarDictionary_Dev();
 
@@ skipping 44 matching lines @@
   /// Gets all the keys in the dictionary.
   ///
   /// @return An array var which contains all the keys of the dictionary.
   /// The elements are string vars. Returns an empty array var if failed.
   VarArray_Dev GetKeys() const;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VAR_DICTIONARY_DEV_H_