base: Remove the string logging from CHECK().

components/pairing/fake_host_pairing_controller.cc

Index: components/pairing/fake_host_pairing_controller.cc
diff --git a/components/pairing/fake_host_pairing_controller.cc b/components/pairing/fake_host_pairing_controller.cc
index f0300f2dd5468cf47a91c98c11f1d1ddf2cd2941..87b20c7066b302a1797693cf8e89c29cd3d36c6b 100644
--- a/components/pairing/fake_host_pairing_controller.cc
+++ b/components/pairing/fake_host_pairing_controller.cc
@@ -41,14 +41,14 @@ FakeHostPairingController::~FakeHostPairingController() {
 
 void FakeHostPairingController::ApplyConfig(const std::string& config) {
   base::StringPairs kv_pairs;
-  CHECK(base::SplitStringIntoKeyValuePairs(config, ':', ',', &kv_pairs))
-      << "Wrong config format.";
+  // Wrong config format.
+  CHECK(base::SplitStringIntoKeyValuePairs(config, ':', ',', &kv_pairs));
   std::map<std::string, std::string> dict(kv_pairs.begin(), kv_pairs.end());
 
   if (dict.count("async_duration")) {
     int ms = 0;
-    CHECK(base::StringToInt(dict["async_duration"], &ms))
-        << "Wrong 'async_duration' format.";
+    // Wrong 'async_duration' format.
+    CHECK(base::StringToInt(dict["async_duration"], &ms));
     async_duration_ = base::TimeDelta::FromMilliseconds(ms);
   } else {
     async_duration_ =
@@ -66,9 +66,10 @@ void FakeHostPairingController::ApplyConfig(const std::string& config) {
     for (size_t i = 0; i < kCodeLength; ++i)
       confirmation_code_.push_back(base::RandInt('0', '9'));
   }
+  // Wrong 'code' format.
   CHECK(confirmation_code_.length() == kCodeLength &&
-        confirmation_code_.find_first_not_of("0123456789") == std::string::npos)
-      << "Wrong 'code' format.";
+        confirmation_code_.find_first_not_of("0123456789") ==
+            std::string::npos);
 
   device_name_ =
       dict.count("device_name") ? dict["device_name"] : "Chromebox-01";