Move MediaQuery classes off BlinkGC heap

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 eeec1a0ee119bb7a84418d230a56da78d6e4c868..cf16c1ee4181ff57957ee2cb8e1abe6e589710d4 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorCSSAgent.cpp
@@ -1580,7 +1580,8 @@ std::unique_ptr<protocol::CSS::CSSMedia> InspectorCSSAgent::buildMediaObject(
   }
 
   const MediaQuerySet* queries = media->queries();
-  const HeapVector<Member<MediaQuery>>& queryVector = queries->queryVector();
+  const Vector<std::unique_ptr<MediaQuery>>& queryVector =
+      queries->queryVector();
   LocalFrame* frame = nullptr;
   if (parentStyleSheet) {
     if (Document* document = parentStyleSheet->ownerDocument())
@@ -1597,15 +1598,15 @@ std::unique_ptr<protocol::CSS::CSSMedia> InspectorCSSAgent::buildMediaObject(
   MediaValues* mediaValues = MediaValues::createDynamicIfFrameExists(frame);
   bool hasMediaQueryItems = false;
   for (size_t i = 0; i < queryVector.size(); ++i) {
-    MediaQuery* query = queryVector.at(i).get();
-    const ExpressionHeapVector& expressions = query->expressions();
+    MediaQuery& query = *queryVector.at(i);
+    const ExpressionHeapVector& expressions = query.expressions();
     std::unique_ptr<protocol::Array<protocol::CSS::MediaQueryExpression>>
         expressionArray =
             protocol::Array<protocol::CSS::MediaQueryExpression>::create();
     bool hasExpressionItems = false;
     for (size_t j = 0; j < expressions.size(); ++j) {
-      MediaQueryExp* mediaQueryExp = expressions.at(j).get();
-      MediaQueryExpValue expValue = mediaQueryExp->expValue();
+      const MediaQueryExp& mediaQueryExp = expressions.at(j);
+      MediaQueryExpValue expValue = mediaQueryExp.expValue();
       if (!expValue.isValue)
         continue;
       const char* valueName =
@@ -1614,7 +1615,7 @@ std::unique_ptr<protocol::CSS::CSSMedia> InspectorCSSAgent::buildMediaObject(
           mediaQueryExpression = protocol::CSS::MediaQueryExpression::create()
                                      .setValue(expValue.value)
                                      .setUnit(String(valueName))
-                                     .setFeature(mediaQueryExp->mediaFeature())
+                                     .setFeature(mediaQueryExp.mediaFeature())
                                      .build();
 
       if (inspectorStyleSheet && media->parentRule())