Bug 1410848 - Use RAII with nsHtml5TreeOpExecutor::mFlushState. r=smaug.

MozReview-Commit-ID: 3a1tyYGT8u5

parser/html/nsHtml5OplessBuilder.cpp

@@ -23,7 +23,7 @@ nsHtml5OplessBuilder::~nsHtml5OplessBuilder()
 void
 nsHtml5OplessBuilder::Start()
 {
-  mFlushState = eInFlush;
+  BeginFlush();
   BeginDocUpdate();
 }
 
@@ -31,6 +31,7 @@ void
 nsHtml5OplessBuilder::Finish()
 {
   EndDocUpdate();
+  EndFlush();
   DropParserAndPerfHint();
   mScriptLoader = nullptr;
   mDocument = nullptr;
@@ -39,7 +40,6 @@ nsHtml5OplessBuilder::Finish()
   mDocumentURI = nullptr;
   mDocShell = nullptr;
   mOwnedElements.Clear();
-  mFlushState = eNotFlushing;
 }
 
 void