base: Remove the string logging from CHECK().

chromeos/network/portal_detector/network_portal_detector.cc

Index: chromeos/network/portal_detector/network_portal_detector.cc
diff --git a/chromeos/network/portal_detector/network_portal_detector.cc b/chromeos/network/portal_detector/network_portal_detector.cc
index 6fcbb3b4eb433a0472c82a1f392de30adcd1c719..75f69fa1bd412a14c8a9a21178556d8ed75af8b8 100644
--- a/chromeos/network/portal_detector/network_portal_detector.cc
+++ b/chromeos/network/portal_detector/network_portal_detector.cc
@@ -47,7 +47,8 @@ namespace network_portal_detector {
 
 void InitializeForTesting(NetworkPortalDetector* network_portal_detector) {
   if (network_portal_detector) {
-    CHECK(!set_for_testing_) << "InitializeForTesting is called twice";
+    // InitializeForTesting is called twice
+    CHECK(!set_for_testing_);
     delete network_portal_detector_;
     network_portal_detector_ = network_portal_detector;
     set_for_testing_ = true;
@@ -66,20 +67,21 @@ bool SetForTesting() {
 }
 
 void Shutdown() {
-  CHECK(network_portal_detector_ || set_for_testing_)
-      << "Shutdown() called without Initialize()";
+  // Shutdown() called without Initialize()
+  CHECK(network_portal_detector_ || set_for_testing_);
   delete network_portal_detector_;
   network_portal_detector_ = nullptr;
 }
 
 NetworkPortalDetector* GetInstance() {
-  CHECK(network_portal_detector_) << "GetInstance() called before Initialize()";
+  // GetInstance() called before Initialize()
+  CHECK(network_portal_detector_);
   return network_portal_detector_;
 }
 
 void SetNetworkPortalDetector(NetworkPortalDetector* network_portal_detector) {
-  CHECK(!network_portal_detector_)
-      << "NetworkPortalDetector was initialized twice.";
+  // NetworkPortalDetector was initialized twice.
+  CHECK(!network_portal_detector_);
   NET_LOG(EVENT) << "SetNetworkPortalDetector";
   network_portal_detector_ = network_portal_detector;
 }