Clean imports

Additional cleanup

Author: GaryQian

runtime/dart_isolate.cc

@@ -1042,10 +1042,6 @@ Dart_Handle DartIsolate::OnDartLoadLibrary(intptr_t loading_unit_id) {
   if (Current()->platform_configuration()) {
     Current()->platform_configuration()->client()->RequestDartDeferredLibrary(
         loading_unit_id);
-  } else {
-    FML_LOG(ERROR) << "Platform Configuration was null. Deferred library load "
-                      "request was not sent for loading unit "
-                   << loading_unit_id << ".";
   }
   return Dart_Null();
 }

runtime/runtime_controller.cc

@@ -4,8 +4,6 @@
 
 #include "flutter/runtime/runtime_controller.h"
 
-#include <sstream>
-
 #include "flutter/fml/message_loop.h"
 #include "flutter/fml/trace_event.h"
 #include "flutter/lib/ui/compositing/scene.h"

testing/elf_loader.cc

@@ -4,11 +4,7 @@
 
 #include "flutter/testing/elf_loader.h"
 
-#include <dlfcn.h>
-
 #include "flutter/fml/file.h"
-#include "flutter/fml/mapping.h"
-#include "flutter/fml/native_library.h"
 #include "flutter/fml/paths.h"
 #include "flutter/runtime/dart_vm.h"
 #include "flutter/testing/testing.h"

testing/elf_loader.h

@@ -9,7 +9,6 @@
 
 #include "flutter/common/settings.h"
 #include "flutter/fml/macros.h"
-#include "flutter/fml/mapping.h"
 #include "third_party/dart/runtime/bin/elf_loader.h"
 
 namespace flutter {