Fix leak: properly destroy TimezoneResolver instance.

chrome/browser/browser_process_platform_part_chromeos.cc

Index: chrome/browser/browser_process_platform_part_chromeos.cc
diff --git a/chrome/browser/browser_process_platform_part_chromeos.cc b/chrome/browser/browser_process_platform_part_chromeos.cc
index 38ecf2b778839a0c0aa662f332611ead9fee8c98..520ba39318fb3ac0a359fef52c7e6e3fb0b614ed 100644
--- a/chrome/browser/browser_process_platform_part_chromeos.cc
+++ b/chrome/browser/browser_process_platform_part_chromeos.cc
@@ -126,6 +126,9 @@ chromeos::TimeZoneResolver* BrowserProcessPlatformPart::GetTimezoneResolver() {
 }
 
 void BrowserProcessPlatformPart::StartTearDown() {
+  // interactive_ui_tests check for memory leaks before this object is
+  // destroyed.  So we need to destroy |timezone_resolver_| here.
+  timezone_resolver_.reset();
   profile_helper_.reset();
 }