Remove dependency on scan-build wrapper script for Clang analysis builds.

build/toolchain/nacl_toolchain.gni

 # Copyright (c) 2014 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/gcc_toolchain.gni")
 
 # This template defines a NaCl toolchain.
 #
 # It requires the following variables specifying the executables to run:
@@ skipping 14 matching lines @@
       executable_extension = ".nexe"
     }
     rebuild_define = "NACL_TC_REV=" + invoker.toolchain_revision
 
     forward_variables_from(invoker,
                            [
                              "ar",
                              "cc",
                              "cxx",
                              "deps",
+                             "is_clang_analysis_supported",
                              "ld",
                              "link_outputs",
                              "nm",
                              "readelf",
                              "strip",
                            ])
 
     toolchain_args = {
       # Use all values set on the invoker's toolchain_args.
       forward_variables_from(invoker.toolchain_args, "*")
 
       current_os = "nacl"
 
       # We do not support component builds with the NaCl toolchains.
       is_component_build = false
 
       # We do not support tcmalloc in the NaCl toolchains.
       use_allocator = "none"
     }
   }
 }