Eliminate "temporary" and "uninitialized" isolated worlds

Source/WebKit/chromium/public/WebFrame.h

Index: Source/WebKit/chromium/public/WebFrame.h
diff --git a/Source/WebKit/chromium/public/WebFrame.h b/Source/WebKit/chromium/public/WebFrame.h
index a4721918f7d836395b5f5c650eed1fcea9b81555..0dc56b3de010238b343171bc2272e3f09bc4e6ab 100644
--- a/Source/WebKit/chromium/public/WebFrame.h
+++ b/Source/WebKit/chromium/public/WebFrame.h
@@ -237,6 +237,8 @@ public:
     // extensionGroup is an embedder-provided specifier that controls which
     // v8 extensions are loaded into the new context - see
     // WebKit::registerExtension for the corresponding specifier.
+    //
+    // worldID must be > 0 (as 0 represents the main world).
     virtual void executeScriptInIsolatedWorld(
         int worldID, const WebScriptSource* sources, unsigned numSources,
         int extensionGroup) = 0;
@@ -272,6 +274,7 @@ public:
     virtual v8::Handle<v8::Value> executeScriptAndReturnValue(
         const WebScriptSource&) = 0;
 
+    // worldID must be > 0 (as 0 represents the main world).
     virtual void executeScriptInIsolatedWorld(
         int worldID, const WebScriptSource* sourcesIn, unsigned numSources,
         int extensionGroup, WebVector<v8::Local<v8::Value> >* results) = 0;