Add per-tab "JavaScript enabled" preference.

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
diff --git a/chrome/browser/tab_contents/render_view_context_menu.cc b/chrome/browser/tab_contents/render_view_context_menu.cc
index ae12b2393dad9c229c7729d1d750abf78d2e2f87..3a0d07059ad0339565ae2ecc018b9eb8492981b9 100644
--- a/chrome/browser/tab_contents/render_view_context_menu.cc
+++ b/chrome/browser/tab_contents/render_view_context_menu.cc
@@ -1808,8 +1808,14 @@ void RenderViewContextMenu::MenuClosed(ui::SimpleMenuModel* source) {
 bool RenderViewContextMenu::IsDevCommandEnabled(int id) const {
   if (id == IDC_CONTENT_CONTEXT_INSPECTELEMENT) {
     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+    TabContentsWrapper* tab_contents_wrapper =
+        TabContentsWrapper::GetCurrentWrapperForContents(
+            source_tab_contents_);
+    if (!tab_contents_wrapper)
+      return false;
     // Don't enable the web inspector if JavaScript is disabled.
-    if (!profile_->GetPrefs()->GetBoolean(prefs::kWebKitJavascriptEnabled) ||
+    if (!tab_contents_wrapper->per_tab_prefs()->GetBoolean(
+            prefs::kWebKitJavascriptEnabled) ||
         command_line.HasSwitch(switches::kDisableJavaScript))
       return false;
     // Don't enable the web inspector if the developer tools are disabled via