Remove Fuchsia SDK's 'launchpad' package definition.

The 'launchpad' package has been removed from the Fuchsia SDK, with its
functionality replaced by fdio_spawn(). The lingering definition will
e.g. block Chromium dependency rolls into V8, so we need to remove it
ASAP.

TBR: jam
Bug: 848028
Change-Id: Iac4ed84b65e9c077c9fe97d75c636f19ff597e74
Reviewed-on: https://chromium-review.googlesource.com/1098675
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567336}

content/common/BUILD.gn

@@ -495,7 +495,7 @@ source_set("common") {
       "sandbox_policy_fuchsia.h",
     ]
 
-    deps += [ "//third_party/fuchsia-sdk:launchpad" ]
+    deps += [ "//third_party/fuchsia-sdk:fdio" ]
   }
 }
 

content/common/sandbox_policy_fuchsia.cc

@@ -4,7 +4,7 @@
 
 #include "content/common/sandbox_policy_fuchsia.h"
 
-#include <launchpad/launchpad.h>
+#include <lib/fdio/spawn.h>
 #include <zircon/processargs.h>
 
 #include "base/base_paths_fuchsia.h"

third_party/fuchsia-sdk/BUILD.gn

@@ -193,16 +193,6 @@ fuchsia_sdk_fidl_pkg("input") {
   ]
 }
 
-# TODO(https://crbug.com/848028): Remove this once no dependencies need it.
-fuchsia_sdk_pkg("launchpad") {
-  sources = [
-    "include/launchpad/launchpad.h",
-    "include/launchpad/vmo.h",
-  ]
-
-  libs = [ "launchpad" ]
-}
-
 fuchsia_sdk_fidl_pkg("math") {
   namespace = "fuchsia"
   namespace_path = "fuchsia"