Update Clang build script and gyp file for 3.8.0 version bump

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 5809 matching lines @@
                   'VCCLCompilerTool': {
                     'AdditionalOptions': [
                       '-fsanitize=address',
                       '-fsanitize-blacklist=<(PRODUCT_DIR)/../../tools/memory/asan/blacklist_win.txt',
                     ],
                     'AdditionalIncludeDirectories': [
                       # MSVC needs to be able to find the sanitizer headers when
                       # invoked via /fallback. This is critical for using macros
                       # like ASAN_UNPOISON_MEMORY_REGION in files where we fall
                       # back.
-                      '<(DEPTH)/<(make_clang_dir)/lib/clang/3.7.0/include_sanitizer',
+                      '<(DEPTH)/<(make_clang_dir)/lib/clang/<!(python <(DEPTH)/tools/clang/scripts/update.py --print-clang-version)/include_sanitizer',
                     ],
                   },
                   'VCLinkerTool': {
                     'AdditionalLibraryDirectories': [
                       # TODO(hans): If make_clang_dir is absolute, this breaks.
-                      '<(DEPTH)/<(make_clang_dir)/lib/clang/3.7.0/lib/windows',
+                      '<(DEPTH)/<(make_clang_dir)/lib/clang/<!(python <(DEPTH)/tools/clang/scripts/update.py --print-clang-version)/lib/windows',
                     ],
                   },
                   'target_conditions': [
                     ['component=="shared_library"', {
                       'VCLinkerTool': {
                         'AdditionalDependencies': [
                            'clang_rt.asan_dynamic-i386.lib',
                            'clang_rt.asan_dynamic_runtime_thunk-i386.lib',
                         ],
                       },
@@ skipping 347 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }