Fix up all the easy virtual ... SK_OVERRIDE cases.

bench/GrMemoryPoolBench.cpp

Index: bench/GrMemoryPoolBench.cpp
diff --git a/bench/GrMemoryPoolBench.cpp b/bench/GrMemoryPoolBench.cpp
index 6e6a37e76c8c2e83917aa002748fb14299e78d94..320ff00f1404c2e2c5da63bbf2630e44b4532d79 100644
--- a/bench/GrMemoryPoolBench.cpp
+++ b/bench/GrMemoryPoolBench.cpp
@@ -32,7 +32,7 @@ GrMemoryPool A::gBenchPool(10 * (1 << 10), 10 * (1 << 10));
  */
 class GrMemoryPoolBenchStack : public Benchmark {
 public:
-    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+    bool isSuitableFor(Backend backend) SK_OVERRIDE {
         return backend == kNonRendering_Backend;
     }
 
@@ -94,7 +94,7 @@ GrMemoryPool B::gBenchPool(10 * (1 << 10), 10 * (1 << 10));
  */
 class GrMemoryPoolBenchRandom : public Benchmark {
 public:
-    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+    bool isSuitableFor(Backend backend) SK_OVERRIDE {
         return backend == kNonRendering_Backend;
     }
 
@@ -142,7 +142,7 @@ class GrMemoryPoolBenchQueue : public Benchmark {
         M = 4 * (1 << 10),
     };
 public:
-    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+    bool isSuitableFor(Backend backend) SK_OVERRIDE {
         return backend == kNonRendering_Backend;
     }