Change grow box computation back to a method on BrowserWindow

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index 2078164e24c882ad439c640e524359ed2a9efc24..2a9bc4f7c939e4f1487d2e5f80bbfd8a3380fc9f 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -34,6 +34,10 @@ bool WebContentsDelegate::CanReloadContents(WebContents* source) const {
   return true;
 }
 
+gfx::Rect WebContentsDelegate::GetRootWindowResizerRect() const {
+  return gfx::Rect();
+}
+
 bool WebContentsDelegate::ShouldSuppressDialogs() {
   return false;
 }