[PPAPI] Fix a bunch of spelling mistakes

ppapi/cpp/dev/var_dictionary_dev.h

Index: ppapi/cpp/dev/var_dictionary_dev.h
diff --git a/ppapi/cpp/dev/var_dictionary_dev.h b/ppapi/cpp/dev/var_dictionary_dev.h
index 5934b810c8f48b11d29d81aabeef9d12d7eb31e7..2b2e79d41af87a36ad8890ee7d8040e1eb467902 100644
--- a/ppapi/cpp/dev/var_dictionary_dev.h
+++ b/ppapi/cpp/dev/var_dictionary_dev.h
@@ -19,14 +19,14 @@ class VarDictionary_Dev : public Var {
   /// 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.