Remove toString() implementations

Author: temawi

xds/src/test/java/io/grpc/xds/WeightedRoundRobinLoadBalancerTest.java

@@ -1240,10 +1240,6 @@ private void verifyLongCounterRecord(String name, int times, long value) {
           public boolean matches(LongCounterMetricInstrument longCounterInstrument) {
             return longCounterInstrument.getName().equals(name);
           }
-
-          public String toString() {
-            return name;
-          }
         }), eq(value), eq(Lists.newArrayList("")), eq(Lists.newArrayList("")));
   }
 
@@ -1256,10 +1252,6 @@ private void verifyDoubleHistogramRecord(String name, int times, double value) {
           public boolean matches(DoubleHistogramMetricInstrument doubleHistogramInstrument) {
             return doubleHistogramInstrument.getName().equals(name);
           }
-
-          public String toString() {
-            return name;
-          }
         }), eq(value), eq(Lists.newArrayList("")), eq(Lists.newArrayList("")));
   }