base: Remove the string logging from CHECK().

net/proxy/proxy_config_service_linux_unittest.cc

 // Copyright (c) 2012 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 "net/proxy/proxy_config_service_linux.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 74 matching lines @@
 // Mapping from a setting name to the location of the corresponding
 // value (inside a EnvVarValues or GConfValues struct).
 template<typename key_type, typename value_type>
 struct SettingsTable {
   typedef std::map<key_type, value_type*> map_type;
 
   // Gets the value from its location
   value_type Get(key_type key) {
     auto it = settings.find(key);
     // In case there's a typo or the unittest becomes out of sync.
-    CHECK(it != settings.end()) << "key " << key << " not found";
+    // key |key| not found
+    CHECK(it != settings.end());
     value_type* value_ptr = it->second;
     return *value_ptr;
   }
 
   map_type settings;
 };
 
 class MockEnvironment : public base::Environment {
  public:
   MockEnvironment() {
@@ skipping 1566 matching lines @@
     EXPECT_EQ(ProxyConfigService::CONFIG_VALID,
               sync_config_getter.SyncGetLatestProxyConfig(&config));
     EXPECT_FALSE(config.auto_detect());
     EXPECT_TRUE(slaverc5_rules.Matches(config.proxy_rules()));
   }
 }
 
 }  // namespace
 
 }  // namespace net