Factor out uses of WebContentsModalDialog interface functions from WebContentsModalDialogManager

chrome/browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm

Index: chrome/browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm b/chrome/browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm
index 3dfbb0959e2ccc48f1100db20c7360670bddaad6..3a5bbbbf30db76470dbd84975caafebfb3253300 100644
--- a/chrome/browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm
+++ b/chrome/browser/ui/cocoa/web_contents_modal_dialog_manager_cocoa.mm
@@ -4,8 +4,53 @@
 
 #include "chrome/browser/ui/web_contents_modal_dialog_manager.h"
 
+#include "chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
+#include "chrome/browser/ui/native_web_contents_modal_dialog_manager.h"
+
+namespace {
+
+class NativeWebContentsModalDialogManagerCocoa
+    : public NativeWebContentsModalDialogManager {
+ public:
+  NativeWebContentsModalDialogManagerCocoa() {
+  }
+
+  virtual ~NativeWebContentsModalDialogManagerCocoa() {
+  }
+
+  // NativeWebContentsModalDialogManager overrides
+  virtual void ManageDialog(NativeWebContentsModalDialog dialog) OVERRIDE {
+  }
+
+  virtual void ShowDialog(NativeWebContentsModalDialog dialog) OVERRIDE {
+    GetConstrainedWindowMac(dialog)->ShowWebContentsModalDialog();
+  }
+
+  virtual void CloseDialog(NativeWebContentsModalDialog dialog) OVERRIDE {
+    GetConstrainedWindowMac(dialog)->CloseWebContentsModalDialog();
+  }
+
+  virtual void FocusDialog(NativeWebContentsModalDialog dialog) OVERRIDE {
+    GetConstrainedWindowMac(dialog)->FocusWebContentsModalDialog();
+  }
+
+  virtual void PulseDialog(NativeWebContentsModalDialog dialog) OVERRIDE {
+    GetConstrainedWindowMac(dialog)->PulseWebContentsModalDialog();
+  }
+
+ private:
+  static ConstrainedWindowMac* GetConstrainedWindowMac(
+      NativeWebContentsModalDialog dialog) {
+    return static_cast<ConstrainedWindowMac*>(dialog);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(NativeWebContentsModalDialogManagerCocoa);
+};
+
+}  // namespace
+
 NativeWebContentsModalDialogManager*
     WebContentsModalDialogManager::CreateNativeManager(
         NativeWebContentsModalDialogManagerDelegate* native_delegate) {
-  return NULL;
+  return new NativeWebContentsModalDialogManagerCocoa;
 }