[tools] Use Extensions.Is instead of Extensions.IsPlatformType. (#9530)

The latter just calls the former.

tools/common/Assembly.cs

@@ -6,6 +6,7 @@ using System.IO;
 using System.Linq;
 using System.Xml;
 using Mono.Cecil;
+using Mono.Tuner;
 using MonoTouch.Tuner;
 using ObjCRuntime;
 using Xamarin;
@@ -243,7 +244,7 @@ namespace Xamarin.Bundler {
 					continue;
 
 				TypeReference type = attr.Constructor.DeclaringType;
-				if (!type.IsPlatformType ("ObjCRuntime", "LinkWithAttribute"))
+				if (!type.Is ("ObjCRuntime", "LinkWithAttribute"))
 					continue;
 
 				// Let the linker remove it the attribute from the assembly

tools/linker/MonoTouch.Tuner/Extensions.cs

@@ -21,10 +21,5 @@ namespace MonoTouch.Tuner {
 
 			return null;
 		}
-
-		public static bool IsPlatformType (this TypeReference type, string @namespace, string name)
-		{
-			return type.Is (@namespace, name);
-		}
 	}
 }

tools/linker/MonoTouch.Tuner/PreserveSmartEnumConversionsSubStep.cs

@@ -32,7 +32,7 @@ namespace Xamarin.Linker.Steps
 
 			// We don't need to process assemblies that don't reference ObjCRuntime.BindAsAttribute.
 			foreach (var tr in assembly.MainModule.GetTypeReferences ()) {
-				if (tr.IsPlatformType ("ObjCRuntime", "BindAsAttribute"))
+				if (tr.Is ("ObjCRuntime", "BindAsAttribute"))
 					return true;
 			}
 
@@ -59,7 +59,7 @@ namespace Xamarin.Linker.Steps
 			foreach (var ca in provider.CustomAttributes) {
 				var tr = ca.Constructor.DeclaringType;
 
-				if (!tr.IsPlatformType ("ObjCRuntime", "BindAsAttribute"))
+				if (!tr.Is ("ObjCRuntime", "BindAsAttribute"))
 					continue;
 
 				if (ca.ConstructorArguments.Count != 1) {
@@ -110,13 +110,13 @@ namespace Xamarin.Linker.Steps
 					if (!method.HasParameters || method.Parameters.Count != 1)
 						continue;
 					if (method.Name == "GetConstant") {
-						if (!method.ReturnType.IsPlatformType ("Foundation", "NSString"))
+						if (!method.ReturnType.Is ("Foundation", "NSString"))
 							continue;
 						if (method.Parameters [0].ParameterType != managedEnumType)
 							continue;
 						getConstant = method;
 					} else if (method.Name == "GetValue") {
-						if (!method.Parameters [0].ParameterType.IsPlatformType ("Foundation", "NSString"))
+						if (!method.Parameters [0].ParameterType.Is ("Foundation", "NSString"))
 							continue;
 						if (method.ReturnType != managedEnumType)
 							continue;