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

chrome/browser/plugins/plugin_power_saver_browsertest.cc

Index: chrome/browser/plugins/plugin_power_saver_browsertest.cc
diff --git a/chrome/browser/plugins/plugin_power_saver_browsertest.cc b/chrome/browser/plugins/plugin_power_saver_browsertest.cc
index a5e47fdd09ff389bb75fd69cc3a6977f323711fa..183b003666aaad4cf8ec46d8e14d97070866bacd 100644
--- a/chrome/browser/plugins/plugin_power_saver_browsertest.cc
+++ b/chrome/browser/plugins/plugin_power_saver_browsertest.cc
@@ -13,6 +13,7 @@
 #include "base/test/scoped_feature_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
+#include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -566,6 +567,10 @@ IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, BlockTinyPlugins) {
   VerifyPluginMarkedEssential(GetActiveWebContents(), "tiny_same_origin");
   VerifyPluginIsPlaceholderOnly("tiny_cross_origin_1");
   VerifyPluginIsPlaceholderOnly("tiny_cross_origin_2");
+
+  TabSpecificContentSettings* tab_specific_content_settings =
+      TabSpecificContentSettings::FromWebContents(GetActiveWebContents());
+  EXPECT_FALSE(tab_specific_content_settings->blocked_plugin_names().empty());
 }
 
 IN_PROC_BROWSER_TEST_F(PluginPowerSaverBrowserTest, BackgroundTabTinyPlugins) {