C++: Remove workaround for crashing if parsing invalid code

This reverts the changes

    commit beac7b9539
    C++: Fix highlighting after "invalid code"

    commit 78ab287fc6
    C++: Stop parsing a declaration after two tries

which were a work around for QTCREATORBUG-12890.

A follow-up patch provides a proper fix.

Task-number: QTCREATORBUG-12890
Change-Id: I2650a8e41c8ff1180cad9f069e463fc51bd2f1b1
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/libs/cplusplus/CppDocument.cpp

@@ -623,13 +623,6 @@ void Document::tokenize()
     _translationUnit->tokenize();
 }
 
-void Document::setRetryHarderToParseDeclarations(bool yesno)
-{
-    _translationUnit->setRetryParseDeclarationLimit(
-                yesno ? 1000
-                      : TranslationUnit::defaultRetryParseDeclarationLimit());
-}
-
 bool Document::isParsed() const
 {
     return _translationUnit->isParsed();