Make PageScaleFactor work for oopif subframes.

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 8e0205585a74f34fefd3c3ab3b629b9d201e5ddc..1b798ecdb18f1cc3fafecd2ecc10473fbb0765a1 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -213,6 +213,7 @@ class WEB_EXPORT WebViewImpl final
   void setInitialPageScaleOverride(float) override;
   void setMaximumLegibleScale(float) override;
   void setPageScaleFactor(float) override;
+  float clampPageScaleFactorToLimits(float) const override;
   void setVisualViewportOffset(const WebFloatPoint&) override;
   WebFloatPoint visualViewportOffset() const override;
   WebFloatSize visualViewportSize() const override;
@@ -279,7 +280,6 @@ class WEB_EXPORT WebViewImpl final
   float defaultMaximumPageScaleFactor() const;
   float minimumPageScaleFactor() const;
   float maximumPageScaleFactor() const;
-  float clampPageScaleFactorToLimits(float) const;
   void resetScaleStateImmediately();
 
   HitTestResult coreHitTestResultAt(const WebPoint&);