samplecode: Remove executable bit from SampleTextureDomain.cpp

R=robertphillips@google.com

Review URL: https://codereview.appspot.com/6570056

git-svn-id: http://skia.googlecode.com/svn/trunk@5703 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleTextureDomain.cpp b/samplecode/SampleTextureDomain.cpp
old mode 100755
new mode 100644