[DevTools] use sourceMapURL and sourceRoot in SourceMap parser on backend

third_party/WebKit/Source/core/inspector/v8/V8DebuggerAgentImpl.cpp

Index: third_party/WebKit/Source/core/inspector/v8/V8DebuggerAgentImpl.cpp
diff --git a/third_party/WebKit/Source/core/inspector/v8/V8DebuggerAgentImpl.cpp b/third_party/WebKit/Source/core/inspector/v8/V8DebuggerAgentImpl.cpp
index 2f580f5399b709b4dcaaa1bd0e1f2c8337fdbd70..1f92f98dd71b9f43f67fdb20e0a7d92b732de500 100644
--- a/third_party/WebKit/Source/core/inspector/v8/V8DebuggerAgentImpl.cpp
+++ b/third_party/WebKit/Source/core/inspector/v8/V8DebuggerAgentImpl.cpp
@@ -133,7 +133,7 @@ static PassOwnPtr<SourceMap> parseSourceMapFromDataUrl(const String& url)
     RefPtr<SharedBuffer> data = PassRefPtr<SharedBuffer>(Platform::current()->parseDataURL(sourceMapURL, mimetype, charset));
     if (!data)
         return nullptr;
-    return SourceMap::parse(String(data->data(), data->size()));
+    return SourceMap::parse(String(data->data(), data->size()), String());
 }
 
 PassOwnPtr<V8DebuggerAgent> V8DebuggerAgent::create(InjectedScriptManager* injectedScriptManager, V8Debugger* debugger, int contextGroupId)