[PPS] Block tiny content by default.

Default to always pausing tiny content. Removing fieldtrial config as
well, since it's redundant.

BUG=608886

Review-Url: https://codereview.chromium.org/2434333002
Cr-Commit-Position: refs/heads/master@{#427171}

chrome/common/chrome_features.cc

@@ -41,7 +41,7 @@ const base::Feature kBlockPromptsIfDismissedOften{
 
 // Experiment to disable small cross-origin content. (http://crbug.com/608886)
 const base::Feature kBlockSmallContent{"BlockSmallPluginContent",
-                                       base::FEATURE_DISABLED_BY_DEFAULT};
+                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Fixes for browser hang bugs are deployed in a field trial in order to measure
 // their impact. See crbug.com/478209.

testing/variations/fieldtrial_testing_config.json

@@ -1319,24 +1319,6 @@
             ]
         }
     ],
-    "PluginPowerSaverTiny": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "win"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "BlockSmallPluginContent"
-                    ]
-                }
-            ]
-        }
-    ],
     "PointerEvent": [
         {
             "platforms": [