Added daily UMA for non-data-reduction-proxy data usage when the proxy is enabled.

BUG=325325

Review URL: https://codereview.chromium.org/106113002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239897 0039d316-1c4b-4281-b951-d872f2087c98
  void CreatePrefList(const char* pref) {
    ListPrefUpdate update(&pref_service_, pref);
    update->Clear();
    for (size_t i = 0; i < kNumDaysInHistory; ++i) {
      update->Insert(0, new StringValue(base::Int64ToString(0)));
    }
  }

  void CreatePrefList(const char* pref) {
    ListPrefUpdate update(&pref_service_, pref);
    update->Clear();
    for (size_t i = 0; i < kNumDaysInHistory; ++i) {
      update->Insert(0, new StringValue(base::Int64ToString(0)));
    }
  }
