[CrOS Tether] Remove spammy log from Initializer.

chrome/browser/chromeos/tether/tether_service.cc

Index: chrome/browser/chromeos/tether/tether_service.cc
diff --git a/chrome/browser/chromeos/tether/tether_service.cc b/chrome/browser/chromeos/tether/tether_service.cc
index 173b014d99a2b8041ff8411d3ae4f4712ee5d2d2..c91e10a95694b747ecf70b69e40619e36c2776f9 100644
--- a/chrome/browser/chromeos/tether/tether_service.cc
+++ b/chrome/browser/chromeos/tether/tether_service.cc
@@ -198,15 +198,24 @@ bool TetherService::HasSyncedTetherHosts() const {
 }
 
 void TetherService::UpdateTetherTechnologyState() {
-  chromeos::NetworkStateHandler::TechnologyState tether_technology_state =
+  bool was_tether_enabled = network_state_handler_->IsTechnologyEnabled(
+      chromeos::NetworkTypePattern::Tether());
+
+  chromeos::NetworkStateHandler::TechnologyState new_tether_technology_state =
       GetTetherTechnologyState();
 
-  network_state_handler_->SetTetherTechnologyState(tether_technology_state);
+  network_state_handler_->SetTetherTechnologyState(new_tether_technology_state);
 
-  if (tether_technology_state ==
-      chromeos::NetworkStateHandler::TechnologyState::TECHNOLOGY_ENABLED) {
+  if (!was_tether_enabled &&

[Ryan Hansberry, 2017/06/26 23:55:08]

Please add a test.

[Kyle Horimoto, 2017/06/27 00:56:01]

Added tests. When testing, I realized that this isn't actually correct all the
time. When changes occur as part of the tether toggle changing in settings, this
would not start/stop at the right time. Kept tests though.

+      new_tether_technology_state ==
+          chromeos::NetworkStateHandler::TechnologyState::TECHNOLOGY_ENABLED) {
+    // Start if the feature is enabled and was not previously running.
     StartTetherIfEnabled();
-  } else {
+  } else if (was_tether_enabled &&
+             new_tether_technology_state !=
+                 chromeos::NetworkStateHandler::TechnologyState::
+                     TECHNOLOGY_ENABLED) {
+    // Stop if the feature is not enabled and was previously running.
     StopTether();
   }
 }