[DevTools] Improve performance of InstrumentingAgents.

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

Index: third_party/WebKit/Source/core/inspector/PageConsoleAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/PageConsoleAgent.cpp b/third_party/WebKit/Source/core/inspector/PageConsoleAgent.cpp
index e2aaf7c445fd115e55a8f03e6866b272f21bb5ae..01eb082e829a67eed05558150da16a05267e1a61 100644
--- a/third_party/WebKit/Source/core/inspector/PageConsoleAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/PageConsoleAgent.cpp
@@ -68,12 +68,12 @@ void PageConsoleAgent::enable(ErrorString* errorString)
 {
     InspectorConsoleAgent::enable(errorString);
     m_workersWithEnabledConsole.clear();
-    m_instrumentingAgents->setPageConsoleAgent(this);
+    m_instrumentingAgents->addPageConsoleAgent(this);
 }
 
 void PageConsoleAgent::disable(ErrorString* errorString)
 {
-    m_instrumentingAgents->setPageConsoleAgent(nullptr);
+    m_instrumentingAgents->removePageConsoleAgent(this);
     InspectorConsoleAgent::disable(errorString);
     m_workersWithEnabledConsole.clear();
 }