Revert r189385 "Remove LifecycleContext" and r189391, r189530, r189456 that block it

Source/bindings/core/v8/V8ScriptRunner.cpp

Index: Source/bindings/core/v8/V8ScriptRunner.cpp
diff --git a/Source/bindings/core/v8/V8ScriptRunner.cpp b/Source/bindings/core/v8/V8ScriptRunner.cpp
index 30bb3486e7c4b7f00cf8638a17098b7110f056c0..4c4ebae2ef8b418c5028ec4b2d3ba1af219b4d10 100644
--- a/Source/bindings/core/v8/V8ScriptRunner.cpp
+++ b/Source/bindings/core/v8/V8ScriptRunner.cpp
@@ -389,6 +389,8 @@ v8::Local<v8::Value> V8ScriptRunner::runCompiledScript(v8::Isolate* isolate, v8:
     if (V8RecursionScope::recursionLevel(isolate) >= kMaxRecursionDepth)
         return throwStackOverflowExceptionIfNeeded(isolate);
 
+    RELEASE_ASSERT(!context->isIteratingOverObservers());
+
     // Run the script and keep track of the current recursion depth.
     v8::Local<v8::Value> result;
     {
@@ -437,6 +439,8 @@ v8::Local<v8::Value> V8ScriptRunner::callFunction(v8::Handle<v8::Function> funct
     if (V8RecursionScope::recursionLevel(isolate) >= kMaxRecursionDepth)
         return throwStackOverflowExceptionIfNeeded(isolate);
 
+    RELEASE_ASSERT(!context->isIteratingOverObservers());
+
     if (ScriptForbiddenScope::isScriptForbidden())
         return v8::Local<v8::Value>();
     V8RecursionScope recursionScope(isolate);