Revert of Collect active stylesheets and and apply asynchronously.

third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp

Index: third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
index 52d7c2de6db375ab973f428d414853057e9e46d0..223fad62ee6033afcf6d179eeee16614806bf2fd 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
@@ -1784,9 +1784,12 @@
 void InspectorCSSAgent::collectAllDocumentStyleSheets(
     Document* document,
     HeapVector<Member<CSSStyleSheet>>& result) {
-  for (const auto& style :
-       document->styleEngine().activeStyleSheetsForInspector())
-    InspectorCSSAgent::collectStyleSheets(style.first, result);
+  const HeapVector<Member<CSSStyleSheet>> activeStyleSheets =
+      document->styleEngine().activeStyleSheetsForInspector();
+  for (const auto& style : activeStyleSheets) {
+    CSSStyleSheet* styleSheet = style.get();
+    InspectorCSSAgent::collectStyleSheets(styleSheet, result);
+  }
 }
 
 // static