Changed clearing out the threadhost with removing a reference to the threadhost.

Author: gaaclarke

shell/common/thread_host.cc

@@ -35,7 +35,7 @@ ThreadHost::ThreadHost(std::string name_prefix_arg, uint64_t mask)
 
 ThreadHost::~ThreadHost() = default;
 
-void ThreadHost::Reset() {
+void ThreadHost::ResetThreads() {
   platform_thread.reset();
   ui_thread.reset();
   raster_thread.reset();

shell/common/thread_host.h

@@ -39,7 +39,7 @@ struct ThreadHost {
 
   ~ThreadHost();
 
-  void Reset();
+  void ResetThreads();
 };
 
 }  // namespace flutter

shell/platform/android/android_shell_holder.cc

@@ -170,7 +170,7 @@ AndroidShellHolder::AndroidShellHolder(
 
 AndroidShellHolder::~AndroidShellHolder() {
   shell_.reset();
-  thread_host_->Reset();
+  thread_host_.reset();
 }
 
 bool AndroidShellHolder::IsValid() const {