Use string for Histogram names since these are all ASCII anyway wide-characte...

chrome/common/ipc_channel_win.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/ipc_channel_win.h"
 
 #include <windows.h>
 #include <sstream>
 
 #include "base/compiler_specific.h"
@@ skipping 53 matching lines @@
     pipe_ = INVALID_HANDLE_VALUE;
   }
 
   // Make sure all IO has completed.
   base::Time start = base::Time::Now();
   while (input_state_.is_pending || output_state_.is_pending) {
     MessageLoopForIO::current()->WaitForIOCompletion(INFINITE, this);
   }
   if (waited) {
     // We want to see if we block the message loop for too long.
-    UMA_HISTOGRAM_TIMES(L"AsyncIO.IPCChannelClose", base::Time::Now() - start);
+    UMA_HISTOGRAM_TIMES("AsyncIO.IPCChannelClose", base::Time::Now() - start);
   }
 
   while (!output_queue_.empty()) {
     Message* m = output_queue_.front();
     output_queue_.pop();
     delete m;
   }
 }
 
 bool Channel::ChannelImpl::Send(Message* message) {
@@ skipping 346 matching lines @@
 
 void Channel::set_listener(Listener* listener) {
   channel_impl_->set_listener(listener);
 }
 
 bool Channel::Send(Message* message) {
   return channel_impl_->Send(message);
 }
 
 }  // namespace IPC