Remove tab parameter from GrGLSLMulVarBy4f function

src/gpu/effects/GrMatrixConvolutionEffect.cpp

Index: src/gpu/effects/GrMatrixConvolutionEffect.cpp
diff --git a/src/gpu/effects/GrMatrixConvolutionEffect.cpp b/src/gpu/effects/GrMatrixConvolutionEffect.cpp
index c0080c61dcc4a3df9f63405d466b580873c902d1..500a07e3bf2f38612df2f0dfaf229fb707e209f1 100644
--- a/src/gpu/effects/GrMatrixConvolutionEffect.cpp
+++ b/src/gpu/effects/GrMatrixConvolutionEffect.cpp
@@ -116,7 +116,7 @@ void GrGLMatrixConvolutionEffect::emitCode(GrGLProgramBuilder* builder,
     }
 
     SkString modulate;
-    GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
+    GrGLSLMulVarBy4f(&modulate, outputColor, inputColor);
     fsBuilder->codeAppend(modulate.c_str());
 }