Move DOM-inspecting language detection logic to Blink.

third_party/WebKit/public/web/WebDocument.h

Index: third_party/WebKit/public/web/WebDocument.h
diff --git a/third_party/WebKit/public/web/WebDocument.h b/third_party/WebKit/public/web/WebDocument.h
index b81c119690581c5bf3b966291cc692706c415953..120fe09be42c1b547c043fdf6db2a433583ecce9 100644
--- a/third_party/WebKit/public/web/WebDocument.h
+++ b/third_party/WebKit/public/web/WebDocument.h
@@ -59,6 +59,7 @@ class WebElementCollection;
 class WebString;
 class WebURL;
 struct WebDistillabilityFeatures;
+struct WebLanguageDetectionDetails;
 
 // Provides readonly access to some properties of a DOM document.
 class WebDocument : public WebNode {
@@ -136,6 +137,7 @@ public:
     BLINK_EXPORT WebURL manifestURL() const;
     BLINK_EXPORT bool manifestUseCredentials() const;
     BLINK_EXPORT WebDistillabilityFeatures distillabilityFeatures();
+    BLINK_EXPORT WebLanguageDetectionDetails languageDetectionDetails();
 
 #if BLINK_IMPLEMENTATION
     WebDocument(const PassRefPtrWillBeRawPtr<Document>&);