Move OmahaQueryParams to a component and add a delegate interface.

apps/shell/browser/shell_browser_main_parts.cc

Index: apps/shell/browser/shell_browser_main_parts.cc
diff --git a/apps/shell/browser/shell_browser_main_parts.cc b/apps/shell/browser/shell_browser_main_parts.cc
index 7c1d2938a10005ff280950c48632688d48011bf2..311a18d952b9d65e9cd6e820ac22e9d45d99f504 100644
--- a/apps/shell/browser/shell_browser_main_parts.cc
+++ b/apps/shell/browser/shell_browser_main_parts.cc
@@ -10,6 +10,7 @@
 #include "apps/shell/browser/shell_extension_system.h"
 #include "apps/shell/browser/shell_extension_system_factory.h"
 #include "apps/shell/browser/shell_extensions_browser_client.h"
+#include "apps/shell/browser/shell_omaha_query_params_delegate.h"
 #include "apps/shell/common/shell_extensions_client.h"
 #include "base/run_loop.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ -99,6 +100,10 @@ void ShellBrowserMainParts::PreMainMessageLoopRun() {
       new extensions::ShellExtensionsBrowserClient(browser_context_.get()));
   extensions::ExtensionsBrowserClient::Set(extensions_browser_client_.get());
 
+  omaha_query_params_delegate_.reset(
+      new extensions::ShellOmahaQueryParamsDelegate);
+  OmahaQueryParamsDelegate::Set(omaha_query_params_delegate_.get());
+
   // Create our custom ExtensionSystem first because other
   // KeyedServices depend on it.
   // TODO(yoz): Move this after EnsureBrowserContextKeyedServiceFactoriesBuilt.