Inject MessageLoop into Capturer

remoting/host/capturer_linux.cc

Index: remoting/host/capturer_linux.cc
diff --git a/remoting/host/capturer_linux.cc b/remoting/host/capturer_linux.cc
index 2f2f8f0cbdbe5677bbc102e43cc281797c08512f..404d52702a31f8638bbc79464ac22e7a792975bd 100644
--- a/remoting/host/capturer_linux.cc
+++ b/remoting/host/capturer_linux.cc
@@ -84,8 +84,9 @@ class CapturerLinuxPimpl {
   bool capture_fullscreen_;
 };
 
-CapturerLinux::CapturerLinux()
-    : pimpl_(new CapturerLinuxPimpl(this)) {
+CapturerLinux::CapturerLinux(MessageLoop* message_loop)
+    : Capturer(message_loop),
+      pimpl_(new CapturerLinuxPimpl(this)) {
   // TODO(ajwong): This should be moved into an Init() method on Capturer
   // itself.  Then we can remove the CHECK.
   CHECK(pimpl_->Init());