android_webview: stop using system libjpeg.

To support unbundled updates we need to stop depending on system
libraries. Disable using the system version of libjpeg and instead link
Chromium's libjpeg_turbo.

This increases binary size by ~120KB.

BUG=409851

Review URL: https://codereview.chromium.org/548513002

Cr-Commit-Position: refs/heads/master@{#293663}

android_webview/buildbot/deps_whitelist.py

@@ -48,6 +48,7 @@ class DepsWhitelist(object):
       'third_party/leveldatabase/src',
       'third_party/libaddressinput/src',
       'third_party/libjingle/source/talk',
+      'third_party/libjpeg_turbo',
       'third_party/libphonenumber/src/phonenumbers',
       'third_party/libphonenumber/src/resources',
       'third_party/libsrtp',

build/common.gypi

@@ -880,12 +880,6 @@
           'use_libjpeg_turbo%': 0,
         }],
 
-        ['OS=="android"', {
-          # When building as part of the Android system, use system libraries
-          # where possible to reduce ROM size.
-          'use_system_libjpeg%': '<(android_webview_build)',
-        }],
-
         # Do not enable the Settings App on ChromeOS.
         ['enable_app_list==1 and chromeos==0', {
           'enable_settings_app%': 1,

third_party/BUILD.gn

@@ -8,7 +8,7 @@ if (is_android) {
 
 declare_args() {
   # Uses system libjpeg. If true, overrides use_libjpeg_turbo.
-  use_system_libjpeg = is_android && is_android_webview_build
+  use_system_libjpeg = false
 
   # Uses libjpeg_turbo as the jpeg implementation. Has no effect if
   # use_system_libjpeg is set.

third_party/libjpeg/libjpeg.gyp

@@ -95,11 +95,6 @@
                   '/usr/local/include',
                 ],
               }],
-              ['OS=="android"', {
-                'include_dirs': [
-                  '<(android_src)/external/jpeg',
-                ],
-              }],
             ],
           },
           'link_settings': {