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