[Mojo Video Capture] Fix VideoCaptureManager exposing implementation details to clients

media/capture/video/video_capture_system.cc

Index: media/capture/video/video_capture_system.cc
diff --git a/media/capture/video/video_capture_system.cc b/media/capture/video/video_capture_system.cc
index 1758eb8fafeba39943ebc53a40cf2c731aa3e3e2..d716d275962de3fe8bb93d8bf5cff285b41bb149 100644
--- a/media/capture/video/video_capture_system.cc
+++ b/media/capture/video/video_capture_system.cc
@@ -57,21 +57,21 @@ void ConsolidateCaptureFormats(media::VideoCaptureFormats* formats) {
 
 namespace media {
 
-VideoCaptureSystem::VideoCaptureSystem(
+VideoCaptureSystemImpl::VideoCaptureSystemImpl(
     std::unique_ptr<VideoCaptureDeviceFactory> factory)
     : factory_(std::move(factory)) {}
 
-VideoCaptureSystem::~VideoCaptureSystem() = default;
+VideoCaptureSystemImpl::~VideoCaptureSystemImpl() = default;
 
-void VideoCaptureSystem::GetDeviceInfosAsync(
+void VideoCaptureSystemImpl::GetDeviceInfosAsync(
     const DeviceInfoCallback& result_callback) {
   factory_->EnumerateDeviceDescriptors(media::BindToCurrentLoop(
-      base::Bind(&VideoCaptureSystem::OnDescriptorsReceived,
+      base::Bind(&VideoCaptureSystemImpl::OnDescriptorsReceived,
                  base::Unretained(this), result_callback)));
 }
 
 // Creates a VideoCaptureDevice object. Returns NULL if something goes wrong.
-std::unique_ptr<VideoCaptureDevice> VideoCaptureSystem::CreateDevice(
+std::unique_ptr<VideoCaptureDevice> VideoCaptureSystemImpl::CreateDevice(
     const std::string& device_id) {
   const VideoCaptureDeviceInfo* device_info = LookupDeviceInfoFromId(device_id);
   if (!device_info)
@@ -79,7 +79,7 @@ std::unique_ptr<VideoCaptureDevice> VideoCaptureSystem::CreateDevice(
   return factory_->CreateDevice(device_info->descriptor);
 }
 
-void VideoCaptureSystem::OnDescriptorsReceived(
+void VideoCaptureSystemImpl::OnDescriptorsReceived(
     const DeviceInfoCallback& result_callback,
     std::unique_ptr<VideoCaptureDeviceDescriptors> descriptors) {
   // For devices for which we already have an entry in |devices_info_cache_|,
@@ -103,7 +103,7 @@ void VideoCaptureSystem::OnDescriptorsReceived(
   result_callback.Run(devices_info_cache_);
 }
 
-const VideoCaptureDeviceInfo* VideoCaptureSystem::LookupDeviceInfoFromId(
+const VideoCaptureDeviceInfo* VideoCaptureSystemImpl::LookupDeviceInfoFromId(
     const std::string& device_id) {
   auto iter = std::find_if(
       devices_info_cache_.begin(), devices_info_cache_.end(),