Issue 351: Reimplement OAuth2 - Step 2 (Auth PCL - only data types)

Src/GoogleApis/Apis/Util/Utilities.cs

Index: Src/GoogleApis/Apis/Util/Utilities.cs
===================================================================
--- a/Src/GoogleApis/Apis/Util/Utilities.cs
 b/Src/GoogleApis/Apis/Util/Utilities.cs
@@ -43,12 43,14 @@
 /// <summary>
 /// Throws an <seealso cref="System.ArgumentNullException"/> if the string is <c>null</c> or empty.
 /// </summary>
- internal static void ThrowIfNullOrEmpty(this string str, string paramName)
 /// <returns>The original string</returns>
 internal static string ThrowIfNullOrEmpty(this string str, string paramName)
 {
 if (string.IsNullOrEmpty(str))
 {
 throw new ArgumentException("Parameter was empty", paramName);
 }
 return str;
 }
 /// <summary>Returns <c>true</c> in case the enumerable is <c>null</c> or empty. </summary>