Change most uses of Pickle to base::Pickle

chrome/browser/extensions/api/automation_internal/automation_internal_api.cc

Index: chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
diff --git a/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc b/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
index f4d2092a7445cbed0ea58fa26113ab52401878cd..ae7acdbcb3b221782c96887f26c30083e7a8e57f 100644
--- a/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
+++ b/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
@@ -82,7 +82,7 @@ class QuerySelectorHandler : public content::WebContentsObserver {
 
     // There may be several requests in flight; check this response matches.
     int message_request_id = 0;
-    PickleIterator iter(message);
+    base::PickleIterator iter(message);
     if (!iter.ReadInt(&message_request_id))
       return false;