SkTDynamicHash: pick up GetKey(), Hash() from T by default.

tests/DynamicHashTest.cpp

Index: tests/DynamicHashTest.cpp
diff --git a/tests/DynamicHashTest.cpp b/tests/DynamicHashTest.cpp
index bb9367b46df5c4d0a23000341c61a68c529afe81..b2da6f388883ac9d00792e72173f39e222a267b0 100644
--- a/tests/DynamicHashTest.cpp
+++ b/tests/DynamicHashTest.cpp
@@ -13,12 +13,13 @@ namespace {
 struct Entry {
     int key;
     double value;
+
+    static const int& GetKey(const Entry& entry) { return entry.key; }
+    static uint32_t Hash(const int& key) { return key; }
 };
 
-const int& GetKey(const Entry& entry) { return entry.key; }
-uint32_t GetHash(const int& key) { return key; }
 
-class Hash : public SkTDynamicHash<Entry, int, GetKey, GetHash> {
+class Hash : public SkTDynamicHash<Entry, int> {
 public:
     Hash() : INHERITED() {}
 
@@ -27,7 +28,7 @@ public:
     int countCollisions(const int& key) const { return this->INHERITED::countCollisions(key); }
 
 private:
-    typedef SkTDynamicHash<Entry, int, GetKey, GetHash> INHERITED;
+    typedef SkTDynamicHash<Entry, int> INHERITED;
 };
 
 }  // namespace