Move WebstoreInstaller, WebstoreInlineInstaller, related in extensions namespace

chrome/browser/extensions/webstore_install_helper.cc

Index: chrome/browser/extensions/webstore_install_helper.cc
diff --git a/chrome/browser/extensions/webstore_install_helper.cc b/chrome/browser/extensions/webstore_install_helper.cc
index 98219dcf8c08ff6c72af48433556bd5c9710cf67..f1960b589a3425551c6fafec9d9b9153a4f15527 100644
--- a/chrome/browser/extensions/webstore_install_helper.cc
+++ b/chrome/browser/extensions/webstore_install_helper.cc
@@ -25,6 +25,8 @@ const char kImageDecodeError[] = "Image decode failed";
 
 }  // namespace
 
+namespace extensions {
+
 WebstoreInstallHelper::WebstoreInstallHelper(
     Delegate* delegate,
     const std::string& id,
@@ -195,3 +197,5 @@ void WebstoreInstallHelper::ReportResultFromUIThread() {
   else
     delegate_->OnWebstoreParseFailure(id_, parse_error_, error_);
 }
+
+}  // namespace extensions