libchrome: Several upstreamable fixes from libchrome

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index 4390d8cda3069f2c63f7dbd83b97765658773e5c..3e883585ac47559d7fcded5c1740ebd4ed00864f 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -205,7 +205,7 @@ class LoggingLock {
     UnlockLogging();
   }
 
-  static void Init(LogLockingState lock_log, const PathChar* new_log_file) {
+  static void Init(LogLockingState lock_log, const PathChar* /*new_log_file*/) {
     if (initialized)
       return;
     lock_log_file = lock_log;
@@ -455,7 +455,7 @@ template std::string* MakeCheckOpString<std::string, std::string>(
     const std::string&, const std::string&, const char* name);
 
 template <>
-void MakeCheckOpValueString(std::ostream* os, const std::nullptr_t& p) {
+void MakeCheckOpValueString(std::ostream* os, const std::nullptr_t&) {
   (*os) << "nullptr";
 }