Migrate fuzzer to use shiny new metrics2 package

go/metrics2/counter.go

Index: go/metrics2/counter.go
diff --git a/go/metrics2/counter.go b/go/metrics2/counter.go
index 15750a505c317504e447f778a2d0be1059cf7afa..cd645de4c59185912983880631d1f6b7324a905b 100644
--- a/go/metrics2/counter.go
+++ b/go/metrics2/counter.go
@@ -51,3 +51,10 @@ func (c *Counter) Reset() {
 	defer c.mtx.Unlock()
 	c.m.Update(0)
 }
+
+// Count returns the current value in the counter.
+func (c *Counter) Count() int64 {

[borenet, 2016/02/10 15:32:32]

For consistency, let's just call this Get()

[kjlubick, 2016/02/10 16:14:29]

Done.

+	c.mtx.Lock()
+	defer c.mtx.Unlock()
+	return c.m.Get()
+}