Autoplay: use an autoplay policy setting in Blink.

third_party/WebKit/Source/web/WebSettingsImpl.h

Index: third_party/WebKit/Source/web/WebSettingsImpl.h
diff --git a/third_party/WebKit/Source/web/WebSettingsImpl.h b/third_party/WebKit/Source/web/WebSettingsImpl.h
index 1a581808f6359f34df7f7c2e11d895b464871707..719ad33dfaf10d16f8ac5d8abbcedc6b2e6cba44 100644
--- a/third_party/WebKit/Source/web/WebSettingsImpl.h
+++ b/third_party/WebKit/Source/web/WebSettingsImpl.h
@@ -52,6 +52,7 @@ class WEB_EXPORT WebSettingsImpl final : NON_EXPORTED_BASE(public WebSettings) {
   bool ViewportEnabled() const override;
   void SetAccelerated2dCanvasMSAASampleCount(int) override;
   void SetAcceleratedCompositingEnabled(bool) override;
+  void SetAutoplayPolicy(AutoplayPolicy) override;
   void SetPreferCompositingToLCDTextEnabled(bool) override;
   void SetAccessibilityEnabled(bool) override;
   void SetAccessibilityPasswordValuesEnabled(bool) override;
@@ -68,7 +69,6 @@ class WEB_EXPORT WebSettingsImpl final : NON_EXPORTED_BASE(public WebSettings) {
   void SetBrowserSideNavigationEnabled(bool) override;
   void SetClobberUserAgentInitialScaleQuirk(bool) override;
   void SetCookieEnabled(bool) override;
-  void SetCrossOriginMediaPlaybackRequiresUserGesture(bool) override;
   void SetNavigateOnDragDrop(bool) override;
   void SetCursiveFontFamily(const WebString&,
                             UScriptCode = USCRIPT_COMMON) override;
@@ -117,7 +117,6 @@ class WEB_EXPORT WebSettingsImpl final : NON_EXPORTED_BASE(public WebSettings) {
   void SetMainFrameClipsContent(bool) override;
   void SetMainFrameResizesAreOrientationChanges(bool) override;
   void SetMaxTouchPoints(int) override;
-  void SetMediaPlaybackRequiresUserGesture(bool) override;
   void SetMediaPlaybackGestureWhitelistScope(const WebString&) override;
   void SetPresentationRequiresUserGesture(bool) override;
   void SetEmbeddedMediaExperienceEnabled(bool) override;