Replace forward declaration with include in default_component_installer.h

chrome/browser/component_updater/default_component_installer.h

Index: chrome/browser/component_updater/default_component_installer.h
diff --git a/chrome/browser/component_updater/default_component_installer.h b/chrome/browser/component_updater/default_component_installer.h
index 7eba71ccf7e21e1fcc595fe2f89b187f538e14c5..b6c1c54a99f6631d7c75934c1cbb37a8d3b1c53b 100644
--- a/chrome/browser/component_updater/default_component_installer.h
+++ b/chrome/browser/component_updater/default_component_installer.h
@@ -12,11 +12,11 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
+#include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/component_updater/component_updater_service.h"
 
 namespace base {
-class DictionaryValue;
 class FilePath;
 class SequencedTaskRunner;
 class SingleThreadTaskRunner;