Credential Manager: Migrate to WebView client-based approach.

public/web/WebView.h

Index: public/web/WebView.h
diff --git a/public/web/WebView.h b/public/web/WebView.h
index ba73fb63ee989f67a229f8af5c006fff630a0027..5383f28a2a1ca150065d32d4ab2206ae598fd75d 100644
--- a/public/web/WebView.h
+++ b/public/web/WebView.h
@@ -44,6 +44,7 @@ namespace blink {
 
 class WebAXObject;
 class WebAutofillClient;
+class WebCredentialManagerClient;
 class WebDevToolsAgent;
 class WebDevToolsAgentClient;
 class WebDragData;
@@ -95,6 +96,7 @@ public:
 
     // Initializes the various client interfaces.
     virtual void setAutofillClient(WebAutofillClient*) = 0;
+    virtual void setCredentialManagerClient(WebCredentialManagerClient*) = 0;
     virtual void setDevToolsAgentClient(WebDevToolsAgentClient*) = 0;
     virtual void setPrerendererClient(WebPrerendererClient*) = 0;
     virtual void setSpellCheckClient(WebSpellCheckClient*) = 0;