Remove ChromeV8Extension & most of ChromeV8Context

chrome/renderer/extensions/file_browser_private_custom_bindings.cc

Index: chrome/renderer/extensions/file_browser_private_custom_bindings.cc
diff --git a/chrome/renderer/extensions/file_browser_private_custom_bindings.cc b/chrome/renderer/extensions/file_browser_private_custom_bindings.cc
index a4aab786afb07b39399a662ac14422f5f14913a1..20afb3d50cffc6c7e33f700d616dfe25703e041e 100644
--- a/chrome/renderer/extensions/file_browser_private_custom_bindings.cc
+++ b/chrome/renderer/extensions/file_browser_private_custom_bindings.cc
@@ -9,7 +9,7 @@
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "chrome/renderer/extensions/chrome_v8_context.h"
-#include "grit/renderer_resources.h"
+#include "extensions/renderer/script_context.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebDOMFileSystem.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
@@ -17,8 +17,8 @@
 namespace extensions {
 
 FileBrowserPrivateCustomBindings::FileBrowserPrivateCustomBindings(
-    Dispatcher* dispatcher, ChromeV8Context* context)
-    : ChromeV8Extension(dispatcher, context) {
+    ScriptContext* context)
+    : ObjectBackedNativeHandler(context) {

[not at google - send to devlin, 2014/04/17 15:11:10]

random place for this comment, but it would be even better if the
ObjectBackedNativeHandler functionality were exposed via composition not
inheritance.

not now, maybe not ever :)

[Ken Rockot(use gerrit already), 2014/04/17 16:17:15]

Thinking about it. We shall see!

   RouteFunction(
       "GetFileSystem",
        base::Bind(&FileBrowserPrivateCustomBindings::GetFileSystem,