Refactor fake Connection subclasses in proximity_auth/ tests to a single file.

components/proximity_auth/throttled_bluetooth_connection_finder_unittest.cc

Index: components/proximity_auth/throttled_bluetooth_connection_finder_unittest.cc
diff --git a/components/proximity_auth/throttled_bluetooth_connection_finder_unittest.cc b/components/proximity_auth/throttled_bluetooth_connection_finder_unittest.cc
index cf2ca7bc05ce7e55eebe43333f7b829bfa232a28..88cebd50784567520d8e8182f5d9702b7f0ea19a 100644
--- a/components/proximity_auth/throttled_bluetooth_connection_finder_unittest.cc
+++ b/components/proximity_auth/throttled_bluetooth_connection_finder_unittest.cc
@@ -9,7 +9,7 @@
 #include "base/time/time.h"
 #include "components/proximity_auth/bluetooth_connection_finder.h"
 #include "components/proximity_auth/bluetooth_throttler.h"
-#include "components/proximity_auth/connection.h"
+#include "components/proximity_auth/fake_connection.h"
 #include "components/proximity_auth/remote_device.h"
 #include "components/proximity_auth/wire_message.h"
 #include "device/bluetooth/bluetooth_uuid.h"
@@ -32,19 +32,6 @@ void SaveConnection(scoped_ptr<Connection>* out,
   *out = connection.Pass();
 }
 
-class StubConnection : public Connection {
- public:
-  StubConnection() : Connection(RemoteDevice()) {}
-  ~StubConnection() override {}
-
-  void Connect() override {}
-  void Disconnect() override {}
-  void SendMessageImpl(scoped_ptr<WireMessage> message) override {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(StubConnection);
-};
-
 class MockBluetoothThrottler : public BluetoothThrottler {
  public:
   MockBluetoothThrottler() {}
@@ -67,7 +54,8 @@ class FakeBluetoothConnectionFinder : public BluetoothConnectionFinder {
   ~FakeBluetoothConnectionFinder() override {}
 
   void Find(const ConnectionCallback& connection_callback) override {
-    connection_callback.Run(make_scoped_ptr(new StubConnection));
+    connection_callback.Run(
+        make_scoped_ptr(new FakeConnection(RemoteDevice())));
   }
 
  private: