Use in-class initializers for base::WeakPtrFactory in content/.

Generated by: https://chromium-review.googlesource.com/c/chromium/src/+/1689216

Bug: 981415
Change-Id: I363f81e8c17cabfb6031666ca0846bcfcbf97b78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693602
Commit-Queue: Matt Falkenhagen <[email protected]>
Reviewed-by: Matt Falkenhagen <[email protected]>
Cr-Commit-Position: refs/heads/master@{#676281}
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index f4e04fa..c02382e1 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -738,7 +738,7 @@
   base::TimeTicks init_start_;
   base::TimeTicks init_end_;
 
-  base::WeakPtrFactory<RenderThreadImpl> weak_factory_;
+  base::WeakPtrFactory<RenderThreadImpl> weak_factory_{this};
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };