Delete the ClientSocketPoolHistograms class.

net/websockets/websocket_handshake_stream_create_helper_test.cc

Index: net/websockets/websocket_handshake_stream_create_helper_test.cc
diff --git a/net/websockets/websocket_handshake_stream_create_helper_test.cc b/net/websockets/websocket_handshake_stream_create_helper_test.cc
index 8edbc66efe3fc54162ec48988952c8cabff18106..a269655b4f7130475efc96b3c0964e5bb41b98e4 100644
--- a/net/websockets/websocket_handshake_stream_create_helper_test.cc
+++ b/net/websockets/websocket_handshake_stream_create_helper_test.cc
@@ -28,8 +28,7 @@ namespace {
 class MockClientSocketHandleFactory {
  public:
   MockClientSocketHandleFactory()
-      : histograms_("a"),
-        pool_(1, 1, &histograms_, socket_factory_maker_.factory()) {}
+      : pool_(1, 1, socket_factory_maker_.factory()) {}
 
   // The created socket expects |expect_written| to be written to the socket,
   // and will respond with |return_to_read|. The test will fail if the expected
@@ -51,7 +50,6 @@ class MockClientSocketHandleFactory {
 
  private:
   WebSocketDeterministicMockClientSocketFactoryMaker socket_factory_maker_;
-  ClientSocketPoolHistograms histograms_;
   MockTransportClientSocketPool pool_;
 
   DISALLOW_COPY_AND_ASSIGN(MockClientSocketHandleFactory);