base: Remove the string logging from CHECK().

components/pdf/renderer/pepper_pdf_host.cc

 // Copyright 2014 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 "components/pdf/renderer/pepper_pdf_host.h"
 
 #include "base/memory/ptr_util.h"
 #include "components/pdf/common/pdf_messages.h"
 #include "components/pdf/renderer/pdf_accessibility_tree.h"
 #include "content/public/common/referrer.h"
@@ skipping 38 matching lines @@
 
 // static
 bool PepperPDFHost::InvokePrintingForInstance(PP_Instance instance_id) {
   return g_print_client_tls.Pointer()->Get()
              ? g_print_client_tls.Pointer()->Get()->Print(instance_id)
              : false;
 }
 
 // static
 void PepperPDFHost::SetPrintClient(PepperPDFHost::PrintClient* client) {
-  CHECK(!g_print_client_tls.Pointer()->Get())
-      << "There should only be a single PrintClient for one RenderThread.";
+  // There should only be a single PrintClient for one RenderThread.
+  CHECK(!g_print_client_tls.Pointer()->Get());
   g_print_client_tls.Pointer()->Set(client);
 }
 
 int32_t PepperPDFHost::OnResourceMessageReceived(
     const IPC::Message& msg,
     ppapi::host::HostMessageContext* context) {
   PPAPI_BEGIN_MESSAGE_MAP(PepperPDFHost, msg)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_PDF_DidStartLoading,
                                         OnHostMsgDidStartLoading)
     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_PDF_DidStopLoading,
@@ skipping 164 matching lines @@
   }
 }
 
 content::RenderFrame* PepperPDFHost::GetRenderFrame() {
   content::PepperPluginInstance* instance =
       host_->GetPluginInstance(pp_instance());
   return instance ? instance->GetRenderFrame() : nullptr;
 }
 
 }  // namespace pdf