Change Page::m_mainFrame to be a Frame.

Source/core/inspector/PageRuntimeAgent.cpp

Index: Source/core/inspector/PageRuntimeAgent.cpp
diff --git a/Source/core/inspector/PageRuntimeAgent.cpp b/Source/core/inspector/PageRuntimeAgent.cpp
index 97987168cd29596678b7890bd8a8e17942843bba..9092f01a2ed3ded6c49a796388f58d74224be5e9 100644
--- a/Source/core/inspector/PageRuntimeAgent.cpp
+++ b/Source/core/inspector/PageRuntimeAgent.cpp
@@ -105,7 +105,7 @@ void PageRuntimeAgent::didCreateIsolatedContext(LocalFrame* frame, ScriptState*
 InjectedScript PageRuntimeAgent::injectedScriptForEval(ErrorString* errorString, const int* executionContextId)
 {
     if (!executionContextId) {
-        ScriptState* scriptState = ScriptState::forMainWorld(m_inspectedPage->mainFrame());
+        ScriptState* scriptState = ScriptState::forMainWorld(m_inspectedPage->deprecatedLocalMainFrame());
         InjectedScript result = injectedScriptManager()->injectedScriptFor(scriptState);
         if (result.isEmpty())
             *errorString = "Internal error: main world execution context not found.";