Plugin Power Saver: Refactor some Tiny plugin code and tests.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index c0b7cf8499249f533dcf3cbd702ffa1c809c4b82..98f8354afa99e9764ea56b20d4fc31fc7a673c96 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -48194,7 +48194,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram name="Plugin.PowerSaver.PeripheralHeuristic"
     enum="PluginPowerSaverPeripheralHeuristicDecision">
   <obsolete>
-    Deprecated in favor of Plugin.PowerSaver.PeripheralHeuristicFinalDecision.
+    Deprecated in favor of Plugin.PowerSaver.PeripheralHeuristicInitialDecision.
   </obsolete>
   <owner>tommycli@chromium.org</owner>
   <summary>
@@ -99856,8 +99856,8 @@ value.
   <int value="1" label="Essential Same-Origin"/>
   <int value="2" label="Essential Cross-Origin Big"/>
   <int value="3" label="Essential Cross-Origin Whitelisted"/>
-  <int value="4" label="Essential Cross-Origin Tiny"/>
-  <int value="5" label="Essential Unknown Size"/>
+  <int value="4" label="Tiny"/>
+  <int value="5" label="Unknown Size"/>
 </enum>
 
 <enum name="PluginPowerSaverPosterParamPresence" type="int">