Remove not needed ExtensionUpdater::default_params_ and its setter.

chrome/browser/extensions/updater/extension_updater.h

Index: chrome/browser/extensions/updater/extension_updater.h
diff --git a/chrome/browser/extensions/updater/extension_updater.h b/chrome/browser/extensions/updater/extension_updater.h
index 3cb450d8d199e44b8f61a3b8f0eaf71fc5f9fa9a..fc87e577c77045d37516ead0e3586ab852a0127c 100644
--- a/chrome/browser/extensions/updater/extension_updater.h
+++ b/chrome/browser/extensions/updater/extension_updater.h
@@ -119,12 +119,6 @@ class ExtensionUpdater : public ExtensionDownloaderDelegate,
   // code should just call CheckSoon().
   bool WillCheckSoon() const;
 
-  // Changes the params that are used for the automatic periodic update checks,
-  // as well as for explicit calls to CheckSoon.
-  void set_default_check_params(const CheckParams& params) {
-    default_params_ = params;

[asargent_no_longer_on_chrome, 2016/01/25 23:11:16]

Can we also kill the default_params_ variable itself, and just pass a temporary
CheckParams() in the calls we make to CheckNow in extension_updater.cc? It
doesn't look like we hold any pointers/references to members of the CheckParams
passed into CheckNow beyond the lifetime of the call. 

[lazyboy, 2016/01/25 23:46:58]

Even better, thanks.
Done.

-  }
-
   // Overrides the extension cache with |extension_cache| for testing.
   void SetExtensionCacheForTesting(ExtensionCache* extension_cache);