Simpler return value from HashTable::add()/HashMap::add() and others

Source/core/inspector/InspectorDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDebuggerAgent.cpp b/Source/core/inspector/InspectorDebuggerAgent.cpp
index 57266f59bb3757f46c98028da10b7bcad92a910c..08edc7a2dbcc20a49ef5d7d2a6e9b1736449cd5f 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDebuggerAgent.cpp
@@ -568,8 +568,9 @@ PassRefPtr<TypeBuilder::Debugger::Location> InspectorDebuggerAgent::resolveBreak
 
     BreakpointIdToDebugServerBreakpointIdsMap::iterator debugServerBreakpointIdsIterator = m_breakpointIdToDebugServerBreakpointIds.find(breakpointId);
     if (debugServerBreakpointIdsIterator == m_breakpointIdToDebugServerBreakpointIds.end())
-        debugServerBreakpointIdsIterator = m_breakpointIdToDebugServerBreakpointIds.set(breakpointId, Vector<String>()).iterator;
-    debugServerBreakpointIdsIterator->value.append(debugServerBreakpointId);
+        m_breakpointIdToDebugServerBreakpointIds.set(breakpointId, Vector<String>()).storedValue->value.append(debugServerBreakpointId);
+    else
+        debugServerBreakpointIdsIterator->value.append(debugServerBreakpointId);
 
     RefPtr<TypeBuilder::Debugger::Location> location = TypeBuilder::Debugger::Location::create()
         .setScriptId(scriptId)