Bump chromium version and disable use_sysroot=0

TBR=harryjin@google.com
BUG=libyuv:534

Review URL: https://codereview.chromium.org/1526163002 .

DEPS

@@ -7,7 +7,7 @@ vars = {
 
   # Roll the Chromium Git hash to pick up newer versions of all the
   # dependencies and tools linked to in setup_links.py.
-  'chromium_revision': 'ec6107434ebf366554bb2af162d602ff34d480c1',
+  'chromium_revision': 'aa8e58a3274d31c25d15f909a2a9190149856b9b',
 }
 
 # NOTE: Prefer revision numbers to tags for svn deps. Use http rather than

libyuv.gyp

@@ -17,6 +17,13 @@
     'GCC_PRECOMPILE_PREFIX_HEADER': 'NO',
   },
   'variables': {
+    'variables': {
+      # Disable use of sysroot for Linux. It's enabled by default in Chromium,
+      # but it currently lacks the libudev-dev package.
+      # TODO(kjellander): Remove when crbug.com/561584 is fixed.
+      'use_sysroot': 0,
+    },
+    'use_sysroot%': '<(use_sysroot)',
     'use_system_libjpeg%': 0,
     'libyuv_disable_jpeg%': 0,
     # 'chromium_code' treats libyuv as internal and increases warning level.