Revert r11782, r11783 and r11790 due to Webkit failures.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 903cb3bcd465b11ff7f149314b6354accf035607..7c51b694c88022d06b66416a9764c5e7badb56b7 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -4521,6 +4521,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> function_name,
     // The heuristics are:
     // - It must not have been prohibited by the caller to Parse (some callers
     //   need a full AST).
+    // - The outer scope must be trivial (only global variables in scope).
     // - The function mustn't be a function expression with an open parenthesis
     //   before; we consider that a hint that the function will be called
     //   immediately, and it would be a waste of time to make it lazily
@@ -4528,6 +4529,8 @@ FunctionLiteral* Parser::ParseFunctionLiteral(Handle<String> function_name,
     // These are all things we can know at this point, without looking at the
     // function itself.
     bool is_lazily_compiled = (mode() == PARSE_LAZILY &&
+                               top_scope_->outer_scope()->is_global_scope() &&
+                               top_scope_->HasTrivialOuterContext() &&
                                !parenthesized_function_);
     parenthesized_function_ = false;  // The bit was set for this function only.