Introduce --cancel-first-run and reduce the strength of --no-first-run.

chrome/browser/first_run/first_run.cc

Index: chrome/browser/first_run/first_run.cc
diff --git a/chrome/browser/first_run/first_run.cc b/chrome/browser/first_run/first_run.cc
index 70fe2a6af77d288c47ad41201ef5969db56d1e4b..a8fdbd11e8d98c5b53c07ada55c39911c829b547 100644
--- a/chrome/browser/first_run/first_run.cc
+++ b/chrome/browser/first_run/first_run.cc
@@ -598,9 +598,10 @@ bool IsChromeFirstRun() {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kForceFirstRun)) {
     internal::first_run_ = internal::FIRST_RUN_TRUE;
-  } else if (command_line->HasSwitch(switches::kNoFirstRun)) {
+  } else if (command_line->HasSwitch(switches::kCancelFirstRun)) {
     internal::first_run_ = internal::FIRST_RUN_CANCEL;
-  } else if (internal::GetFirstRunSentinelFilePath(&first_run_sentinel) &&
+  } else if (!command_line->HasSwitch(switches::kNoFirstRun) &&
+             internal::GetFirstRunSentinelFilePath(&first_run_sentinel) &&
              !base::PathExists(first_run_sentinel)) {
     internal::first_run_ = internal::FIRST_RUN_TRUE;
   }
@@ -608,6 +609,11 @@ bool IsChromeFirstRun() {
   return internal::first_run_ == internal::FIRST_RUN_TRUE;
 }
 
+bool IsFirstRunSuppressed(const CommandLine& command_line) {
+  return command_line.HasSwitch(switches::kCancelFirstRun) ||
+      command_line.HasSwitch(switches::kNoFirstRun);
+}
+
 void CreateSentinelIfNeeded() {
   if (IsChromeFirstRun() ||
       internal::first_run_ == internal::FIRST_RUN_CANCEL) {