Move component updater artifacts into component_updater namespace.

chrome/browser/component_updater/component_unpacker.cc

Index: chrome/browser/component_updater/component_unpacker.cc
diff --git a/chrome/browser/component_updater/component_unpacker.cc b/chrome/browser/component_updater/component_unpacker.cc
index ba9f658f12bda215813fbd1972b96dd1d0a1c49d..dc9bddbaa5e2b3dc01a913679fb118b29778a9b3 100644
--- a/chrome/browser/component_updater/component_unpacker.cc
+++ b/chrome/browser/component_updater/component_unpacker.cc
@@ -24,6 +24,8 @@
 
 using crypto::SecureHash;
 
+namespace component_updater {
+
 namespace {
 
 // This class makes sure that the CRX digital signature is valid
@@ -208,3 +210,6 @@ ComponentUnpacker::~ComponentUnpacker() {
   if (!unpack_path_.empty())
     base::DeleteFile(unpack_path_, true);
 }
+
+}  // namespace component_updater
+