Use fuchsia-hosted third-party mirrors

We are unable to check out github.googlesource.com directly; use
fuchsia.googlesource.com to host and clone these repos from.

Change-Id: I7364b98296cfe787ef61f030f4e7c0ddf6829d8c
diff --git a/manifest.xml b/manifest.xml
index 3b23d0a..ad19c2b 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -10,17 +10,20 @@
     <project
         name="github.com/google/fonts"
         path="github.com/google/fonts"
-        remote="sso://github/google/fonts"
+        remote="https://fuchsia.googlesource.com/third_party/google/fonts"
+        remotebranch="upstream/master"
         revision="76d80d204e18c793158aaeb80e524197a333a68a"/>
     <project
         name="github.com/google/material-design-icons"
         path="github.com/google/material-design-icons"
-        remote="sso://github/google/material-design-icons"
+        remote="https://fuchsia.googlesource.com/third_party/google/material-design-icons"
+        remotebranch="upstream/master"
         revision="224895a86501195e7a7ff3dde18e39f00b8e3d5a"/>
     <project
         name="github.com/googlefonts/noto-cjk"
         path="github.com/googlefonts/noto-cjk"
-        remote="sso://github/googlefonts/noto-cjk"
+        remote="https://fuchsia.googlesource.com/third_party/googlefonts/noto-cjk"
+        remotebranch="upstream/master"
         revision="be6c059ac1587e556e2412b27f5155c8eb3ddbe6"/>
   </projects>
 </manifest>