Fix nits in PermissionServiceContext.

Modernize the code and fix lint errors.

Change-Id: Id258594a62be1fc8467028fbbca008184174d314
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1843511
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703842}

diff --git a/content/browser/permissions/permission_service_context.cc b/content/browser/permissions/permission_service_context.cc
index 921cc41..c3ab8129 100644
--- a/content/browser/permissions/permission_service_context.cc
+++ b/content/browser/permissions/permission_service_context.cc

@@ -28,6 +28,8 @@
     observer_.set_disconnect_handler(base::BindOnce(
         &PermissionSubscription::OnConnectionError, base::Unretained(this)));
   }
+  PermissionSubscription(const PermissionSubscription&) = delete;
+  PermissionSubscription& operator=(const PermissionSubscription&) = delete;
 
   ~PermissionSubscription() {
     DCHECK_NE(id_, 0);
@@ -50,7 +52,7 @@
   void set_id(int id) { id_ = id; }
 
  private:
-  PermissionServiceContext* context_;
+  PermissionServiceContext* const context_;
   mojo::Remote<blink::mojom::PermissionObserver> observer_;
   int id_ = 0;
 };
@@ -110,16 +112,16 @@
       PermissionControllerImpl::FromBrowserContext(browser_context)
           ->SubscribePermissionStatusChange(
               permission_type, render_frame_host_, requesting_origin,
-              base::Bind(&PermissionSubscription::OnPermissionStatusChanged,
-                         base::Unretained(subscription.get())));
+              base::BindRepeating(
+                  &PermissionSubscription::OnPermissionStatusChanged,
+                  base::Unretained(subscription.get())));
   subscription->set_id(subscription_id);
   subscriptions_[subscription_id] = std::move(subscription);
 }
 
 void PermissionServiceContext::ObserverHadConnectionError(int subscription_id) {
-  auto it = subscriptions_.find(subscription_id);
-  DCHECK(it != subscriptions_.end());
-  subscriptions_.erase(it);
+  size_t erased = subscriptions_.erase(subscription_id);
+  DCHECK_EQ(1u, erased);
 }
 
 void PermissionServiceContext::RenderFrameHostChanged(
@@ -168,8 +170,4 @@
                         : GURL();
 }
 
-RenderFrameHost* PermissionServiceContext::render_frame_host() const {
-  return render_frame_host_;
-}
-
-} // namespace content
+}  // namespace content

diff --git a/content/browser/permissions/permission_service_context.h b/content/browser/permissions/permission_service_context.h
index c54f763f..4f93be5 100644
--- a/content/browser/permissions/permission_service_context.h
+++ b/content/browser/permissions/permission_service_context.h

@@ -5,7 +5,9 @@
 #ifndef CONTENT_BROWSER_PERMISSIONS_PERMISSION_SERVICE_CONTEXT_H_
 #define CONTENT_BROWSER_PERMISSIONS_PERMISSION_SERVICE_CONTEXT_H_
 
-#include "base/macros.h"
+#include <memory>
+#include <unordered_map>
+
 #include "content/common/content_export.h"
 #include "content/public/browser/permission_type.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -32,6 +34,8 @@
  public:
   explicit PermissionServiceContext(RenderFrameHost* render_frame_host);
   explicit PermissionServiceContext(RenderProcessHost* render_process_host);
+  PermissionServiceContext(const PermissionServiceContext&) = delete;
+  PermissionServiceContext& operator=(const PermissionServiceContext&) = delete;
   ~PermissionServiceContext() override;
 
   void CreateService(
@@ -55,7 +59,7 @@
 
   GURL GetEmbeddingOrigin() const;
 
-  RenderFrameHost* render_frame_host() const;
+  RenderFrameHost* render_frame_host() const { return render_frame_host_; }
   RenderProcessHost* render_process_host() const {
     return render_process_host_;
   }
@@ -69,15 +73,13 @@
   void FrameDeleted(RenderFrameHost* render_frame_host) override;
   void DidFinishNavigation(NavigationHandle* navigation_handle) override;
 
-  void CloseBindings(RenderFrameHost*);
+  void CloseBindings(RenderFrameHost* render_frame_host);
 
-  RenderFrameHost* render_frame_host_;
-  RenderProcessHost* render_process_host_;
+  RenderFrameHost* const render_frame_host_;
+  RenderProcessHost* const render_process_host_;
   mojo::UniqueReceiverSet<blink::mojom::PermissionService> services_;
   std::unordered_map<int, std::unique_ptr<PermissionSubscription>>
       subscriptions_;
-
-  DISALLOW_COPY_AND_ASSIGN(PermissionServiceContext);
 };
 
 }  // namespace content