Remove duplicate modetest value from feedback

This gets set here and then also by debugd when we request it to
generate more log data for feedback. The invocation in debugd is more
specific and covers more cases and would have been overwriting this one
anyways, so let's remove this one.

Bug: 961857
Test: Builds
Change-Id: I0581954708287689def01fdb53c18a2a4d2da5b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1606781
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#658772}

chrome/browser/chromeos/system_logs/command_line_log_source.cc

@@ -60,9 +60,6 @@ void ExecuteCommandLines(system_logs::SystemLogsResponse* response) {
   command = base::CommandLine((base::FilePath("/usr/bin/printenv")));
   commands.emplace_back("env", command);
 
-  command = base::CommandLine(base::FilePath("/usr/bin/modetest"));
-  commands.emplace_back("modetest", command);
-
   // Get a list of file sizes for the whole system (excluding the names of the
   // files in the Downloads directory for privay reasons).
   if (base::SysInfo::IsRunningOnChromeOS()) {