Added unittests for SystemLogUploader.

chrome/browser/chromeos/policy/system_log_delegate.cc

Index: chrome/browser/chromeos/policy/system_log_delegate.cc
diff --git a/chrome/browser/chromeos/policy/system_log_delegate.cc b/chrome/browser/chromeos/policy/system_log_delegate.cc
index 750efe468c05a0d0c951cdca6aa5585aad435b3c..68934db25339fc6b8c0c4f264f7efa587d0f7833 100644
--- a/chrome/browser/chromeos/policy/system_log_delegate.cc
+++ b/chrome/browser/chromeos/policy/system_log_delegate.cc
@@ -16,8 +16,8 @@
 
 namespace {
 
-// File names of system logs to upload.
-// Note: do not add anything  to this list without checking for PII in the file.
+// The file names of the system logs to upload.
+// Note: do not add anything to this list without checking for PII in the file.
 const char* const kSystemLogFileNames[] = {"/var/log/bios_info.txt",
                                            "/var/log/chrome/chrome",
                                            "/var/log/eventlog.txt",
@@ -41,7 +41,7 @@ void SystemLogDelegate::LoadSystemLogs(
   SystemLogUploadJob::SystemLogs* system_logs =
       new SystemLogUploadJob::SystemLogs();
   // Run ReadFiles() in the thread that interacts with the file system
-  // and return to current thread.
+  // and return to the current thread.
   content::BrowserThread::PostTaskAndReply(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&SystemLogDelegate::ReadFiles, weak_ptr_factory_.GetWeakPtr(),
@@ -72,8 +72,8 @@ void SystemLogDelegate::ReadFiles(SystemLogUploadJob::SystemLogs* system_logs) {
     system_logs->push_back(std::make_pair(file_path, std::string()));
     if (!base::ReadFileToString(base::FilePath(file_path),
                                 &(system_logs->back().second))) {
-      LOG(ERROR) << "Failed to read system log file from disk " << file_path
-                 << std::endl;
+      LOG(ERROR) << "Failed to read the system log file from the disk "
+                 << file_path << std::endl;
     }
   }
 }