Move GetDocument method from WebFrame to WebLocalFrame.

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 8a88a7b9fa44ef1a04a2e1170e7b159be36922c5..ee3a0c6aca40082453a5a467364ee866ef76f05b 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -159,8 +159,8 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
       const base::string16& source) const override;
   bool ShouldGatherSiteIsolationStats() const override;
   std::unique_ptr<blink::WebContentSettingsClient>
-  CreateWorkerContentSettingsClient(content::RenderFrame* render_frame,
-                                    blink::WebFrame* frame) override;
+  CreateWorkerContentSettingsClient(
+      content::RenderFrame* render_frame) override;

[Łukasz Anforowicz, 2017/06/15 20:15:59]

In theory, I could change the type of the 2nd parameter to WebLocalFrame, but
implementations can always get the 2nd argument from the 1st argument:
|render_frame->GetWebFrame()|.  This is safe/valid, because the only caller of
this virtual method is RenderFrameImpl::CreateWorkerContentSettingsClientProxy,
which (before this CL) would always pass equivalent of |this->GetWebFrame()| as
the last argument.

   bool AllowPepperMediaStreamAPI(const GURL& url) override;
   void AddSupportedKeySystems(
       std::vector<std::unique_ptr<::media::KeySystemProperties>>* key_systems)