docs: update examples to follow styleguide

Remove usage of DISALLOW_COPY_AND_ASSIGN from documentation.

styleguide/c++/c++-dos-and-donts.md:
'DISALLOW_COPY_AND_ASSIGN` is deprecated.  For
a non-copyable/movable type, delete the copy operations (the move
operations will be implicitly deleted); otherwise, declare either
copy operations, move operations, or both (a non-declared pair
will be implicitly deleted).  Always declare or delete both
construction and assignment, not just one (which can introduce
subtle bugs).

Change-Id: I2d2e0ecf95c3ef764dc90d49c674625c15432d87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404905Reviewed-by: Tal Pressman <talp@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#806782}

docs/tab_helpers.md

@@ -50,6 +50,8 @@ class TitleLoggerTabHelper
     : public content::WebContentsObserver,
       public content::WebContentsUserData<TitleLoggerTabHelper> {
  public:
+  TitleLoggerTabHelper(const TitleLoggerTabHelper&) = delete;
+  TitleLoggerTabHelper& operator=(const TitleLoggerTabHelper&) = delete;
   ~TitleLoggerTabHelper() override;
 
   // content::WebContentsObserver
@@ -60,8 +62,6 @@ class TitleLoggerTabHelper
  private:
   explicit TitleLoggerTabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<TitleLoggerTabHelper>;
-
-  DISALLOW_COPY_AND_ASSIGN(TitleLoggerTabHelper);
 };
 ```
 

docs/webui_in_components.md

@@ -142,9 +142,10 @@ Next we need a class to handle requests to this new resource URL. Typically this
 class HelloWorldUI : public content::WebUIController {
  public:
   explicit HelloWorldUI(content::WebUI* web_ui);
+  HelloWorldUI(const HelloWorldUI&) = delete;
+  HelloWorldUI& operator=(const HelloWorldUI&) = delete;
   ~HelloWorldUI() override;
  private:
-  DISALLOW_COPY_AND_ASSIGN(HelloWorldUI);
 };
 
 #endif  // COMPONENTS_HELLO_WORLD_HELLO_WORLD_UI_H_
@@ -257,8 +258,6 @@ You probably want your new WebUI page to be able to do something or get informat
 +  private:
 +   // Add two numbers together using integer arithmetic.
 +   void AddNumbers(const base::ListValue* args);
-
-    DISALLOW_COPY_AND_ASSIGN(HelloWorldUI);
   };
 ```
 

extensions/docs/api_functions.md

@@ -97,14 +97,14 @@ GizmoFrobulateFunction : public ExtensionFunction {
   DECLARE_EXTENSION_FUNCTION("gizmo.frobulate", GIZMO_FROBULATE)
 
   GizmoFrobulateFunction();
+  GizmoFrobulateFunction(const GizmoFrobulateFunction&) = delete;
+  GizmoFrobulateFunction& operator=(const GizmoFrobulateFunction&) = delete;
 
  private:
   ~GizmoFrobulateFunction() override;
 
   // ExtensionFunction:
   ResponseAction Run() override;
-
-  DISALLOW_COPY_AND_ASSIGN(GizmoFrobulateFunction);
 };
 ```