Remove io.Writer model from io/ioutil

ql/src/semmle/go/frameworks/stdlib/IoIoutil.qll

@@ -38,19 +38,4 @@ module IoIoutil {
       input = inp and output = outp
     }
   }
-
-  private class MethodModels extends TaintTracking::FunctionModel, Method {
-    FunctionInput inp;
-    FunctionOutput outp;
-
-    MethodModels() {
-      // signature: func (Writer).Write(p []byte) (n int, err error)
-      this.implements("io", "Writer", "Write") and
-      (inp.isParameter(0) and outp.isReceiver())
-    }
-
-    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
-      input = inp and output = outp
-    }
-  }
 }

ql/test/library-tests/semmle/go/frameworks/StdlibTaintFlow/IoIoutil.go

@@ -19,13 +19,6 @@ func TaintStepTest_IoIoutilReadAll_B0I0O0(sourceCQL interface{}) interface{} {
 	return intoByte650
 }
 
-func TaintStepTest_IoWriterWrite_B0I0O0(sourceCQL interface{}) interface{} {
-	fromByte784 := sourceCQL.([]byte)
-	var intoWriter957 io.Writer
-	intoWriter957.Write(fromByte784)
-	return intoWriter957
-}
-
 func RunAllTaints_IoIoutil() {
 	{
 		source := newSource(0)
@@ -37,9 +30,4 @@ func RunAllTaints_IoIoutil() {
 		out := TaintStepTest_IoIoutilReadAll_B0I0O0(source)
 		sink(1, out)
 	}
-	{
-		source := newSource(2)
-		out := TaintStepTest_IoWriterWrite_B0I0O0(source)
-		sink(2, out)
-	}
 }