Revert of Standardize usage of virtual/override/final in ipc/

ipc/mojo/ipc_channel_mojo.cc

Index: ipc/mojo/ipc_channel_mojo.cc
diff --git a/ipc/mojo/ipc_channel_mojo.cc b/ipc/mojo/ipc_channel_mojo.cc
index a93adf168efb68c8822392d4e32ed826825d7cf3..a5663411e5ca0f77a1f303b2f96e15c2e2db968f 100644
--- a/ipc/mojo/ipc_channel_mojo.cc
+++ b/ipc/mojo/ipc_channel_mojo.cc
@@ -27,9 +27,11 @@
                      Channel::Mode mode)
       : delegate_(delegate), channel_handle_(channel_handle), mode_(mode) {}
 
-  std::string GetName() const override { return channel_handle_.name; }
-
-  scoped_ptr<Channel> BuildChannel(Listener* listener) override {
+  virtual std::string GetName() const override {
+    return channel_handle_.name;
+  }
+
+  virtual scoped_ptr<Channel> BuildChannel(Listener* listener) override {
     return ChannelMojo::Create(delegate_, channel_handle_, mode_, listener);
   }