Add dummy implementation of about_flags for Android.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 54342ea919db15e3a9d7cefbb047261bf8c78da6..de5fc550eef68182bb17e30fd9641e7e02a6c918 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -1248,14 +1248,12 @@ int ChromeBrowserMainParts::PreCreateThreadsImpl() {
   master_prefs_.reset(new first_run::MasterPrefs);
   browser_creator_.reset(new StartupBrowserCreator);
 
-#if !defined(OS_ANDROID)
   // Convert active labs into switches. This needs to be done before
   // ResourceBundle::InitSharedInstanceWithLocale as some loaded resources are
   // affected by experiment flags (--touch-optimized-ui in particular). Not
   // needed on Android as there aren't experimental flags.
   about_flags::ConvertFlagsToSwitches(local_state_,
                                       CommandLine::ForCurrentProcess());
-#endif
   local_state_->UpdateCommandLinePrefStore(CommandLine::ForCurrentProcess());
 
   // Reset the command line in the crash report details, since we may have
@@ -1755,9 +1753,7 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
 
   HandleTestParameters(parsed_command_line());
   RecordBreakpadStatusUMA(browser_process_->metrics_service());
-#if !defined(OS_ANDROID)
   about_flags::RecordUMAStatistics(local_state_);
-#endif
   LanguageUsageMetrics::RecordAcceptLanguages(
       profile_->GetPrefs()->GetString(prefs::kAcceptLanguages));
   LanguageUsageMetrics::RecordApplicationLanguage(