Persist info about subresources on pages for DNS pre-resolution

The DNS pre-resolution system already "learns" what domains are commonly
needed when rendering sub-resources of a page at a given domain.
This patch saves (some of) the information learned into a persistent
pref, and restores it on startup.

For now, I put in a wimpy pruning of the list each time I save, so that
the list will not grow endlessly from session to session.  I probably need
a better pruning algorithm, such as one that prunes after a given amount
of time, rather than only during shutdown.  For now, this should get
a lot of nice results, and provide slightly larger than needed lists to
users that have long lived sessions, which is similar to the current 
performance, where I didn't persist any info, and only pruned (actually
discarded) all learned info at shutdown.

r=mbelshe
Review URL: http://codereview.chromium.org/21374

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@9912 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 2 insertions, 2 deletions

diff --git a/base/values.h b/base/values.h
index 19a1cb9..cad1311 100644
--- a/base/values.h
+++ b/base/values.h
@@ -260,14 +260,14 @@ class DictionaryValue : public Value {
   // It can't be used to modify the dictionary.
   class key_iterator
     : private std::iterator<std::input_iterator_tag, const std::wstring> {
-  public:
+   public:
     key_iterator(ValueMap::const_iterator itr) { itr_ = itr; }
     key_iterator operator++() { ++itr_; return *this; }
     const std::wstring& operator*() { return itr_->first; }
     bool operator!=(const key_iterator& other) { return itr_ != other.itr_; }
     bool operator==(const key_iterator& other) { return itr_ == other.itr_; }
 
-  private:
+   private:
     ValueMap::const_iterator itr_;
   };