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

content/renderer/peripheral_content_heuristic.cc

Index: content/renderer/peripheral_content_heuristic.cc
diff --git a/content/renderer/peripheral_content_heuristic.cc b/content/renderer/peripheral_content_heuristic.cc
index 3b36af811c11e192958e4124d67c6c45df9c4f86..e6cbcce45b493d04ed718d643a05cbad9980fdcd 100644
--- a/content/renderer/peripheral_content_heuristic.cc
+++ b/content/renderer/peripheral_content_heuristic.cc
@@ -45,11 +45,11 @@ PeripheralContentHeuristic::GetPeripheralStatus(
     return RenderFrame::CONTENT_STATUS_ESSENTIAL_CROSS_ORIGIN_WHITELISTED;
 
   if (unobscured_size.IsEmpty())
-    return RenderFrame::CONTENT_STATUS_ESSENTIAL_UNKNOWN_SIZE;
+    return RenderFrame::CONTENT_STATUS_UNKNOWN_SIZE;
 
   if (unobscured_size.width() <= kTinyContentSize &&
       unobscured_size.height() <= kTinyContentSize) {
-    return RenderFrame::CONTENT_STATUS_ESSENTIAL_CROSS_ORIGIN_TINY;
+    return RenderFrame::CONTENT_STATUS_TINY;
   }
 
   if (IsLargeContent(unobscured_size))