base: Remove the string logging from CHECK().

content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc

Index: content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
diff --git a/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc b/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
index 18ba495e05d6983cd2eace2a824cc45569dc6bd0..a516df4adad140ee8912fddebdf367a9d7039566 100644
--- a/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
+++ b/content/renderer/media/cdm/pepper_cdm_wrapper_impl.cc
@@ -63,8 +63,8 @@ std::unique_ptr<PepperCdmWrapper> PepperCdmWrapperImpl::Create(
 
   GURL plugin_url(plugin_instance->container()->document().url());
   GURL plugin_security_origin = plugin_url.GetOrigin();
-  CHECK_EQ(security_origin, plugin_security_origin)
-      << "Pepper instance has a different origin than the EME call.";
+  // Pepper instance has a different origin than the EME call.
+  CHECK_EQ(security_origin, plugin_security_origin);
 
   if (!plugin_instance->GetContentDecryptorDelegate())
     return std::unique_ptr<PepperCdmWrapper>();