base: Remove the string logging from CHECK().

mojo/public/cpp/bindings/tests/binding_callback_unittest.cc

Index: mojo/public/cpp/bindings/tests/binding_callback_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/binding_callback_unittest.cc b/mojo/public/cpp/bindings/tests/binding_callback_unittest.cc
index 02b082a5354ed0cdb4b21aa3d669dd781fd3f0eb..6a35d54b3d7dd769c2ad54e118b09aa30d35ccab 100644
--- a/mojo/public/cpp/bindings/tests/binding_callback_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/binding_callback_unittest.cc
@@ -89,23 +89,27 @@ class InterfaceImpl : public sample::Provider {
 
   void EchoString(const std::string& a,
                   const EchoStringCallback& callback) override {
-    CHECK(false) << "Not implemented.";
+    // Not implemented.
+    CHECK(false);
   }
 
   void EchoStrings(const std::string& a,
                    const std::string& b,
                    const EchoStringsCallback& callback) override {
-    CHECK(false) << "Not implemented.";
+    // Not implemented.
+    CHECK(false);
   }
 
   void EchoMessagePipeHandle(
       ScopedMessagePipeHandle a,
       const EchoMessagePipeHandleCallback& callback) override {
-    CHECK(false) << "Not implemented.";
+    // Not implemented.
+    CHECK(false);
   }
 
   void EchoEnum(sample::Enum a, const EchoEnumCallback& callback) override {
-    CHECK(false) << "Not implemented.";
+    // Not implemented.
+    CHECK(false);
   }
 
   void resetLastServerValueSeen() { last_server_value_seen_ = 0; }