mojo: update examples to follow styleguide

Remove usage of DISALLOW_COPY_AND_ASSIGN from mojo 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: Iad752e093643a0f964056c1d4b6714cea724728f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398069Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#805164}

docs/mojo_and_services.md

@@ -180,6 +180,8 @@ class PingResponderImpl : example::mojom::PingResponder {
  public:
   explicit PingResponderImpl(mojo::PendingReceiver<example::mojom::PingResponder> receiver)
       : receiver_(this, std::move(receiver)) {}
+  PingResponderImpl(const PingResponderImpl&) = delete;
+  PingResponderImpl& operator=(const PingResponderImpl&) = delete;
 
   // example::mojom::PingResponder:
   void Ping(PingCallback callback) override {
@@ -189,8 +191,6 @@ class PingResponderImpl : example::mojom::PingResponder {
 
  private:
   mojo::Receiver<example::mojom::PingResponder> receiver_;
-
-  DISALLOW_COPY_AND_ASSIGN(PingResponderImpl);
 };
 ```
 
@@ -303,6 +303,8 @@ class MathService : public mojom::MathService {
  public:
   explicit MathService(mojo::PendingReceiver<mojom::MathService> receiver);
   ~MathService() override;
+  MathService(const MathService&) = delete;
+  MathService& operator=(const MathService&) = delete;
 
  private:
   // mojom::MathService:
@@ -311,8 +313,6 @@ class MathService : public mojom::MathService {
               DivideCallback callback) override;
 
   mojo::Receiver<mojom::MathService> receiver_;
-
-  DISALLOW_COPY_AND_ASSIGN(MathService);
 };
 
 }  // namespace math

mojo/public/cpp/bindings/README.md

@@ -237,6 +237,8 @@ class LoggerImpl : public sample::mojom::Logger {
   explicit LoggerImpl(mojo::PendingReceiver<sample::mojom::Logger> receiver)
       : receiver_(this, std::move(receiver)) {}
   ~Logger() override {}
+  Logger(const Logger&) = delete;
+  Logger& operator=(const Logger&) = delete;
 
   // sample::mojom::Logger:
   void Log(const std::string& message) override {
@@ -245,8 +247,6 @@ class LoggerImpl : public sample::mojom::Logger {
 
  private:
   mojo::Receiver<sample::mojom::Logger> receiver_;
-
-  DISALLOW_COPY_AND_ASSIGN(LoggerImpl);
 };
 ```
 
@@ -331,6 +331,8 @@ class LoggerImpl : public sample::mojom::Logger {
   explicit LoggerImpl(mojo::PendingReceiver<sample::mojom::Logger> receiver)
       : receiver_(this, std::move(receiver)) {}
   ~Logger() override {}
+  Logger(const Logger&) = delete;
+  Logger& operator=(const Logger&) = delete;
 
   // sample::mojom::Logger:
   void Log(const std::string& message) override {
@@ -345,8 +347,6 @@ class LoggerImpl : public sample::mojom::Logger {
  private:
   mojo::Receiver<sample::mojom::Logger> receiver_;
   std::vector<std::string> lines_;
-
-  DISALLOW_COPY_AND_ASSIGN(LoggerImpl);
 };
 ```