Add Blink setting to block doc.written scripts on 2g-like networks

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 91475903159ac756c749f9a16b56ee8e959dd371..1f05fbac716da0602d0a1acb9279bb2288a08078 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -545,6 +545,9 @@ class CONTENT_EXPORT RenderFrameImpl
   void didChangeThemeColor() override;
   void dispatchLoad() override;
   blink::WebEffectiveConnectionType getEffectiveConnectionType() override;
+  void setEffectiveConnectionTypeOverride(
+      blink::WebEffectiveConnectionType effective_type) override;
+  void clearEffectiveConnectionTypeOverride() override;
   void didChangeSelection(bool is_empty_selection) override;
   bool handleCurrentKeyboardEvent() override;
   blink::WebColorChooser* createColorChooser(
@@ -1233,6 +1236,10 @@ class CONTENT_EXPORT RenderFrameImpl
   // Effective connection type when the document of this frame was fetched.
   blink::WebEffectiveConnectionType effective_connection_type_;
 
+  // Overridden effective connection type used for blink internals.
+  blink::WebEffectiveConnectionType effective_connection_type_override_;
+  bool effective_connection_type_overridden_;
+
   // Whether or not this RenderFrame is currently pasting.
   bool is_pasting_;