Move component updater artifacts into component_updater namespace.

chrome/browser/component_updater/test/test_installer.h

Index: chrome/browser/component_updater/test/test_installer.h
diff --git a/chrome/browser/component_updater/test/test_installer.h b/chrome/browser/component_updater/test/test_installer.h
index 2233d88479fd1e64fcd3b5e5b75c093abdf755f1..e93eeba9c40f9832067239ed8acbaeec4a136c20 100644
--- a/chrome/browser/component_updater/test/test_installer.h
+++ b/chrome/browser/component_updater/test/test_installer.h
@@ -13,6 +13,8 @@ namespace base {
 class DictionaryValue;
 }
 
+namespace component_updater {
+
 // A TestInstaller is an installer that does nothing for installation except
 // increment a counter.
 class TestInstaller : public ComponentInstaller {
@@ -70,4 +72,6 @@ class VersionedTestInstaller : public TestInstaller {
   Version current_version_;
 };
 
+}  // namespace component_updater
+
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_TEST_TEST_INSTALLER_H_