Revert of [DevTools] Remove edited scripts from debugger agent, move knowledge to frontend.

Source/core/inspector/PageDebuggerAgent.cpp

Index: Source/core/inspector/PageDebuggerAgent.cpp
diff --git a/Source/core/inspector/PageDebuggerAgent.cpp b/Source/core/inspector/PageDebuggerAgent.cpp
index be1ab9da12870f058a113e11afd0aed7c36e4601..7c62a5a16deb2588707eab846d3b64edae04fc0b 100644
--- a/Source/core/inspector/PageDebuggerAgent.cpp
+++ b/Source/core/inspector/PageDebuggerAgent.cpp
@@ -176,6 +176,11 @@
     reset();
 }
 
+void PageDebuggerAgent::didCommitLoadForLocalFrame(LocalFrame*)
+{
+    resetModifiedSources();
+}
+
 void PageDebuggerAgent::compileScript(ErrorString* errorString, const String& expression, const String& sourceURL, bool persistScript, const int* executionContextId, TypeBuilder::OptOutput<ScriptId>* scriptId, RefPtr<ExceptionDetails>& exceptionDetails)
 {
     InjectedScript injectedScript = injectedScriptForEval(errorString, executionContextId);