ui: Cleanup class/struct forward declarations

chrome/browser/component_updater/swiftshader_component_installer.cc

Index: chrome/browser/component_updater/swiftshader_component_installer.cc
diff --git a/chrome/browser/component_updater/swiftshader_component_installer.cc b/chrome/browser/component_updater/swiftshader_component_installer.cc
index 411c8db491b82796258a4058a6e751c31c00690d..9ce9a750719a614124fbffc25fee4ac4b4e113a6 100644
--- a/chrome/browser/component_updater/swiftshader_component_installer.cc
+++ b/chrome/browser/component_updater/swiftshader_component_installer.cc
@@ -10,6 +10,7 @@
 
 #include "base/base_paths.h"
 #include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ -21,6 +22,7 @@
 #include "components/component_updater/component_updater_paths.h"
 #include "components/component_updater/component_updater_service.h"
 #include "components/update_client/update_client.h"
+#include "components/update_client/utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/gpu_data_manager.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
@@ -104,8 +106,9 @@ class SwiftShaderComponentInstaller : public update_client::CrxInstaller {
   // ComponentInstaller implementation:
   void OnUpdateError(int error) override;
 
-  bool Install(const base::DictionaryValue& manifest,
-               const base::FilePath& unpack_path) override;
+  update_client::CrxInstaller::Result Install(
+      const base::DictionaryValue& manifest,
+      const base::FilePath& unpack_path) override;
 
   bool GetInstalledFile(const std::string& file,
                         base::FilePath* installed_file) override;
@@ -115,6 +118,9 @@ class SwiftShaderComponentInstaller : public update_client::CrxInstaller {
  private:
   ~SwiftShaderComponentInstaller() override {}
 
+  bool DoInstall(const base::DictionaryValue& manifest,
+                 const base::FilePath& unpack_path);
+
   base::Version current_version_;
 };
 
@@ -128,7 +134,15 @@ void SwiftShaderComponentInstaller::OnUpdateError(int error) {
   NOTREACHED() << "SwiftShader update error: " << error;
 }
 
-bool SwiftShaderComponentInstaller::Install(
+update_client::CrxInstaller::Result SwiftShaderComponentInstaller::Install(
+    const base::DictionaryValue& manifest,
+    const base::FilePath& unpack_path) {
+  return update_client::InstallFunctionWrapper(base::Bind(
+      &SwiftShaderComponentInstaller::DoInstall, base::Unretained(this),
+      base::ConstRef(manifest), base::ConstRef(unpack_path)));
+}
+
+bool SwiftShaderComponentInstaller::DoInstall(
     const base::DictionaryValue& manifest,
     const base::FilePath& unpack_path) {
   std::string name;