Move chrome.fileSystem implementation to //extensions

chrome/browser/extensions/api/chrome_extensions_api_client.h

Index: chrome/browser/extensions/api/chrome_extensions_api_client.h
diff --git a/chrome/browser/extensions/api/chrome_extensions_api_client.h b/chrome/browser/extensions/api/chrome_extensions_api_client.h
index 134df5119802c9343d5bfecfe4709bbb7d3549ec..1b791b9726de05d35e5995c2ff32d11c45691c3c 100644
--- a/chrome/browser/extensions/api/chrome_extensions_api_client.h
+++ b/chrome/browser/extensions/api/chrome_extensions_api_client.h
@@ -55,6 +55,7 @@ class ChromeExtensionsAPIClient : public ExtensionsAPIClient {
   ManagementAPIDelegate* CreateManagementAPIDelegate() const override;
   MetricsPrivateDelegate* GetMetricsPrivateDelegate() override;
   NetworkingCastPrivateDelegate* GetNetworkingCastPrivateDelegate() override;
+  FileSystemDelegate* GetFileSystemDelegate() override;
 
 #if defined(OS_CHROMEOS)
   NonNativeFileSystemDelegate* GetNonNativeFileSystemDelegate() override;
@@ -71,6 +72,7 @@ class ChromeExtensionsAPIClient : public ExtensionsAPIClient {
   std::unique_ptr<ChromeMetricsPrivateDelegate> metrics_private_delegate_;
   std::unique_ptr<NetworkingCastPrivateDelegate>
       networking_cast_private_delegate_;
+  std::unique_ptr<FileSystemDelegate> file_system_delegate_;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<NonNativeFileSystemDelegate> non_native_file_system_delegate_;