Make LogMessage() handle strings with null bytes

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index c4366d839c0c134e6f442585b698b9c4f22fb1c1..ed6b69ba7c6c134b85bc4db928ad5da2b637ad5a 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -609,13 +609,13 @@ LogMessage::~LogMessage() {
     }
     __android_log_write(priority, "chromium", str_newline.c_str());
 #endif
-    fprintf(stderr, "%s", str_newline.c_str());
+    ignore_result(fwrite(str_newline.data(), str_newline.size(), 1, stderr));
     fflush(stderr);
   } else if (severity_ >= kAlwaysPrintErrorLevel) {
     // When we're only outputting to a log file, above a certain log level, we
     // should still output to stderr so that we can better detect and diagnose
     // problems with unit tests, especially on the buildbots.
-    fprintf(stderr, "%s", str_newline.c_str());
+    ignore_result(fwrite(str_newline.data(), str_newline.size(), 1, stderr));
     fflush(stderr);
   }
 
@@ -640,7 +640,8 @@ LogMessage::~LogMessage() {
                 &num_written,
                 NULL);
 #else
-      fprintf(log_file, "%s", str_newline.c_str());
+      ignore_result(fwrite(
+          str_newline.data(), str_newline.size(), 1, log_file));
       fflush(log_file);
 #endif
     }