Clean up SkImageFilter.

Rename more occurences of 'target' to 'kernelOffset'.
This is a follow-up patch to
https://codereview.chromium.org/182983003/

BUG=skia:2187
R=senorblanco@chromium.org

Author: dominikg@chromium.org

Review URL: https://codereview.chromium.org/197013003

git-svn-id: http://skia.googlecode.com/svn/trunk@13768 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/MatrixConvolutionBench.cpp b/bench/MatrixConvolutionBench.cpp
index 8252973..77910c9 100644
--- a/bench/MatrixConvolutionBench.cpp
+++ b/bench/MatrixConvolutionBench.cpp
@@ -22,8 +22,8 @@
             SkIntToScalar( 1), SkIntToScalar( 1), SkIntToScalar( 1),
         };
         SkScalar gain = 0.3f, bias = SkIntToScalar(100);
-        SkIPoint target = SkIPoint::Make(1, 1);
-        fFilter = SkMatrixConvolutionImageFilter::Create(kernelSize, kernel, gain, bias, target, tileMode, convolveAlpha);
+        SkIPoint kernelOffset = SkIPoint::Make(1, 1);
+        fFilter = SkMatrixConvolutionImageFilter::Create(kernelSize, kernel, gain, bias, kernelOffset, tileMode, convolveAlpha);
     }
 
     ~MatrixConvolutionBench() {