Remove unused NormalizeBench::fUsePortable field.

bench/MathBench.cpp

Index: bench/MathBench.cpp
diff --git a/bench/MathBench.cpp b/bench/MathBench.cpp
index 8092f13823ac12c603d6b2be50d3de6272911fce..1fc5705be829946e2b4f00a55562985f796994d0 100644
--- a/bench/MathBench.cpp
+++ b/bench/MathBench.cpp
@@ -439,12 +439,10 @@ class NormalizeBench : public SkBenchmark {
         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 FloorBench(p, true); )
 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); )