Replace WIDEVINE_CDM_AVAILABLE with a gyp define 'enable_widevine_cdm'.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/component_updater/widevine_cdm_component_installer.h"
 
 #include <stdint.h>
 #include <string.h>
 #include <string>
 #include <vector>
@@ skipping 14 matching lines @@
 #include "build/build_config.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/widevine_cdm_constants.h"
 #include "components/component_updater/component_updater_service.h"
 #include "components/component_updater/default_component_installer.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/plugin_service.h"
 #include "content/public/common/pepper_plugin_info.h"
 #include "media/cdm/ppapi/supported_cdm_versions.h"
 #include "third_party/widevine/cdm/widevine_cdm_common.h"

[ddorwin, 2014/12/02 23:31:56]

We shouldn't need this in most places - it's included by the version file
anyway. However, where we aren't using the version but do need some piece of
information, we should prefer this to the version file. (See below for why the
version files are problematic.)

 
 #include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR. NOLINT

[ddorwin, 2014/12/02 23:31:56]

We should be able to eliminate many, if not most, of these includes and the 11
corresponding instances of a dependency on
widevine_cdm.gyp:widevine_cdm_version_h: 
https://code.google.com/p/chromium/codesearch#search/&q=widevine_cdm.gyp%3Awi...
We'll need to find the GN equivalents too.

We should also be able to remove some of the corresponding .gyp/.gn uses of
SHARED_INTERMEDIATE_DIR, though we need to be careful there are not other
dependencies. Sometimes there are comments documenting the dependency.

 
 using content::BrowserThread;
 using content::PluginService;
 
 namespace component_updater {
 
-#if defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
+#if defined(ENABLE_WIDEVINE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 
 namespace {
 
 // CRX hash. The extension id is: oimompecagnajdejgnnjijobebaeigek.
 const uint8_t kSha2Hash[] = {0xe8, 0xce, 0xcf, 0x42, 0x06, 0xd0, 0x93, 0x49,
                              0x6d, 0xd9, 0x89, 0xe1, 0x41, 0x04, 0x86, 0x4a,
                              0x8f, 0xbd, 0x86, 0x12, 0xb9, 0x58, 0x9b, 0xfb,
                              0x4f, 0xbb, 0x1b, 0xa9, 0xd3, 0x85, 0x37, 0xef};
 
 // File name of the Widevine CDM component manifest on different platforms.
@@ skipping 299 matching lines @@
   }
 
   BrowserThread::PostTask(content::BrowserThread::UI,
                           FROM_HERE,
                           base::Bind(&RegisterWidevineCdmWithChrome,
                                      cdm_version,
                                      adapter_install_path,
                                      base::Passed(&manifest)));
 }
 
-#endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
+#endif  // defined(ENABLE_WIDEVINE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 
 void RegisterWidevineCdmComponent(ComponentUpdateService* cus) {
-#if defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
+#if defined(ENABLE_WIDEVINE) && defined(WIDEVINE_CDM_IS_COMPONENT)
   base::FilePath adapter_source_path;
   PathService::Get(chrome::FILE_WIDEVINE_CDM_ADAPTER, &adapter_source_path);
   if (!base::PathExists(adapter_source_path))
     return;
   scoped_ptr<ComponentInstallerTraits> traits(
       new WidevineCdmComponentInstallerTraits);
   // |cus| will take ownership of |installer| during installer->Register(cus).
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(traits.Pass());
   installer->Register(cus);
 #else
   return;
-#endif  // defined(WIDEVINE_CDM_AVAILABLE) && defined(WIDEVINE_CDM_IS_COMPONENT)
+#endif  // defined(ENABLE_WIDEVINE) && defined(WIDEVINE_CDM_IS_COMPONENT)
 }
 
 }  // namespace component_updater