Don't use IsOnBatteryPower as initial "has controls" value :|

Whoops. No test unfortunately since there's no good way to test
this other than hard coding the expected default values in the
test itself, which is generally not a good test.

BUG=779192
TEST=none
TBR=mlamouri

Change-Id: I00d26ef715fac4884017ce295639ee6aab37d777
Reviewed-on: https://chromium-review.googlesource.com/1138648Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575376}

media/blink/watch_time_reporter.cc

@@ -509,7 +509,7 @@ WatchTimeReporter::CreateControlsComponent() {
                                              FOREGROUND_KEY(NativeControlsOff)};
 
   return std::make_unique<WatchTimeComponent<bool>>(
-      IsOnBatteryPower(), std::move(keys_to_finalize),
+      false, std::move(keys_to_finalize),
       base::BindRepeating(&WatchTimeReporter::GetControlsKey,
                           base::Unretained(this)),
       get_media_time_cb_, recorder_.get());