Remove defunct members of WiFi class

After removing progressive scan, we don't use these anymore.

BUG=chromium:602716
TEST=make, unittests

Change-Id: I4648e9a8207187daa3b23f6db50dfff6e617911a
diff --git a/wifi/wifi.cc b/wifi/wifi.cc
index 6a5b642..a8577f5 100644
--- a/wifi/wifi.cc
+++ b/wifi/wifi.cc
@@ -175,12 +175,8 @@
       scan_interval_seconds_(kDefaultScanIntervalSeconds),
       scan_configuration_("Full scan"),
       netlink_manager_(NetlinkManager::GetInstance()),
-      min_frequencies_to_scan_(kMinumumFrequenciesToScan),
-      max_frequencies_to_scan_(std::numeric_limits<int>::max()),
-      scan_all_frequencies_(true),
       random_mac_supported_(false),
       random_mac_enabled_(false),
-      fraction_per_scan_(kDefaultFractionPerScan),
       scan_state_(kScanIdle),
       scan_method_(kScanMethodNone),
       receive_byte_count_at_connect_(0),
diff --git a/wifi/wifi.h b/wifi/wifi.h
index be45052..bde5fba 100644
--- a/wifi/wifi.h
+++ b/wifi/wifi.h
@@ -702,9 +702,6 @@
   std::string scan_configuration_;
   NetlinkManager* netlink_manager_;
   std::set<uint16_t> all_scan_frequencies_;
-  size_t min_frequencies_to_scan_;
-  size_t max_frequencies_to_scan_;
-  bool scan_all_frequencies_;
 
   bool random_mac_supported_;
   bool random_mac_enabled_;
@@ -713,12 +710,6 @@
   // closure for processing the pending tasks in PendingScanResultsHandler().
   std::unique_ptr<PendingScanResults> pending_scan_results_;
 
-  // Fraction of previously seen scan frequencies to include in each
-  // progressive scan batch (since the frequencies are sorted, the sum of the
-  // fraction_per_scan_ over the scans in a session (* 100) is the percentile
-  // of the frequencies that have been scanned).
-  float fraction_per_scan_;
-
   ScanState scan_state_;
   ScanMethod scan_method_;
   chromeos_metrics::Timer scan_timer_;
diff --git a/wifi/wifi_unittest.cc b/wifi/wifi_unittest.cc
index 6154531..9d032ab 100644
--- a/wifi/wifi_unittest.cc
+++ b/wifi/wifi_unittest.cc
@@ -698,11 +698,6 @@
     return wifi_->all_scan_frequencies_.size();
   }
 
-  void SetScanSize(int min, int max) {
-    wifi_->min_frequencies_to_scan_ = min;
-    wifi_->max_frequencies_to_scan_ = max;
-  }
-
   void InstallMockWakeOnWiFi() {
     wake_on_wifi_ = new MockWakeOnWiFi(&netlink_manager_, event_dispatcher_,
                                        &metrics_);