Revert "[scheduler] Throttle background frames with 1% CPU limit"

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index b282b309791af2c0335a7ccc6b75a292753592d5..95c8d00d309f176f22d8811125f638b86873a209 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -45,11 +45,6 @@ const base::Feature kDefaultEnableGpuRasterization{
 const base::Feature kDocumentWriteEvaluator{"DocumentWriteEvaluator",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
-// Throttle tasks in Blink background timer queues based on CPU budgets
-// for the background tab. Bug: https://crbug.com/639852.
-const base::Feature kExpensiveBackgroundTimerThrottling{
-    "ExpensiveBackgroundTimerThrottling", base::FEATURE_DISABLED_BY_DEFAULT};
-
 // Enables the Feature Policy framework for granting and removing access to
 // other features through HTTP headers.
 const base::Feature kFeaturePolicy{"FeaturePolicy",