Turn off tickcount from default app shell LOG setting

The app shell (content shell) sets the default LOG setting to
have tick counts. This means a LOG(INFO) looks like:
[42745:775:1031/103842.350408:395648516798307:INFO:LocalFrameView.cpp(3456)] test

This patch updates the default setting to not have the tick
count so LOG is less verbose. I think this will promote more LOG usage
and happier developers. A LOG(INFO) now looks like:
[42846:775:1031/104021.499705:INFO:LocalFrameView.cpp(3456)] test

Change-Id: I37b27730114519e8f08f59bf076eb3b090bcb12e
Reviewed-on: https://chromium-review.googlesource.com/747363Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513023}

content/shell/app/shell_main_delegate.cc

@@ -120,7 +120,8 @@ void InitLogging(const base::CommandLine& command_line) {
   settings.log_file = log_filename.value().c_str();
   settings.delete_old = logging::DELETE_OLD_LOG_FILE;
   logging::InitLogging(settings);
-  logging::SetLogItems(true, true, true, true);
+  logging::SetLogItems(true /* Process ID */, true /* Thread ID */,
+                       true /* Timestamp */, false /* Tick count */);
 }
 
 }  // namespace