Remove unused NormalizeBench::fUsePortable field.

To address build warnings:

../bench/MathBench.cpp:442:10: error: private field 'fUsePortable' is not used
[-Werror,-Wunused-private-field]
bool fUsePortable;
     ^

R=reed@google.com

Author: fmalita@chromium.org

Review URL: https://chromiumcodereview.appspot.com/17463002

git-svn-id: http://skia.googlecode.com/svn/trunk@9677 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/MathBench.cpp b/bench/MathBench.cpp
index 8092f13..1fc5705 100644
--- a/bench/MathBench.cpp
+++ b/bench/MathBench.cpp
@@ -439,12 +439,10 @@
         LOOP = SkBENCHLOOP(1000),
     };
     SkVector fVec[ARRAY];
-    bool fUsePortable;
 
 public:
-    NormalizeBench(void* param, bool usePortable)
-    : INHERITED(param)
-    , fUsePortable(usePortable) {
+    NormalizeBench(void* param)
+    : INHERITED(param) {
 
         SkRandom rand;
         for (int i = 0; i < ARRAY; ++i) {
@@ -502,4 +500,4 @@
 DEF_BENCH( return new CLZBench(p, false); )
 DEF_BENCH( return new CLZBench(p, true); )
 
-DEF_BENCH( return new NormalizeBench(p, false); )
+DEF_BENCH( return new NormalizeBench(p); )