[Fuchsia] Correct TODO to refer to the Chromium tracking bug.

TBR=alexmos

Bug: 1010256, fuchsia:36774, b/140763277
Change-Id: I9fd94a2435a35c22945100e054caae6ab0e5052b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1836434Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702222}

content/common/user_agent.cc

@@ -39,8 +39,8 @@ std::string GetUserAgentPlatform() {
 #elif defined(OS_ANDROID)
   return "Linux; ";
 #elif defined(OS_FUCHSIA)
-  // TODO(https://bugs.fuchsia.dev/p/fuchsia/issues/detail?id=36774#c11): Sites
-  // get confused into serving mobile content if we report only "Fuchsia".
+  // TODO(https://crbug.com/1010256): Sites get confused into serving mobile
+  // content if we report only "Fuchsia".
   return "X11; ";
 #elif defined(OS_POSIX)
   return "Unknown; ";