Fix page zoom to be frame-centric for out-of-process frames.

content/browser/renderer_host/render_view_host_delegate.cc

Index: content/browser/renderer_host/render_view_host_delegate.cc
diff --git a/content/browser/renderer_host/render_view_host_delegate.cc b/content/browser/renderer_host/render_view_host_delegate.cc
index c169a056f28a0c8a98852ab942859999db2c83bb..8d0db229edd440faace72b0c2d750f5e2a0880dc 100644
--- a/content/browser/renderer_host/render_view_host_delegate.cc
+++ b/content/browser/renderer_host/render_view_host_delegate.cc
@@ -36,6 +36,10 @@ FrameTree* RenderViewHostDelegate::GetFrameTree() {
   return NULL;
 }
 
+double RenderViewHostDelegate::PageZoomLevel() {
+  return 0.0;
+}
+
 bool RenderViewHostDelegate::IsNeverVisible() {
   return false;
 }