Replace Handle<> with Local in remaining gin/*

gin/test/gtest.cc

Index: gin/test/gtest.cc
diff --git a/gin/test/gtest.cc b/gin/test/gtest.cc
index b4060a3b591f61727d80d9f6e2a0e10167e32df2..76aaf1f6f45d32ba0aa7afbcdcaa6c70c5fceaf5 100644
--- a/gin/test/gtest.cc
+++ b/gin/test/gtest.cc
@@ -31,8 +31,8 @@ void ExpectFalse(bool condition, const std::string& description) {
   EXPECT_FALSE(condition) << description;
 }
 
-void ExpectEqual(const v8::Handle<v8::Value> expected,
-                 const v8::Handle<v8::Value> actual,
+void ExpectEqual(const v8::Local<v8::Value> expected,
+                 const v8::Local<v8::Value> actual,
                  const std::string& description) {
   EXPECT_TRUE(expected->StrictEquals(actual)) << description;
 }