DEPS: Remove root_dir variable.

Due to legacy reasons, libyuv uses a root_dir variable in the DEPS file.
It was used to make the bots checkout into a 'src' dir instead of 'libyuv',
in order to get some tools working that had hard-coded assumptions on the name
'src' of the top-level directory. This changes all those dirs to be named
'src', which is needed to get tools_libyuv/autoroller/roll_deps.py to work
while keeping the buildbot infrastructure working.

BUG=libyuv:690
TBR=fbarchard@chromium.org

Change-Id: Ia138264d2576e3a9db95efa3de72a14531c92752
Reviewed-on: https://chromium-review.googlesource.com/447913Reviewed-by: Frank Barchard <fbarchard@google.com>

docs/getting_started.md

@@ -11,13 +11,13 @@ Refer to chromium instructions for each platform for other prerequisites.
 
 Create a working directory, enter it, and run:
 
-    gclient config https://chromium.googlesource.com/libyuv/libyuv
+    gclient config --name src https://chromium.googlesource.com/libyuv/libyuv
     gclient sync
 
 Then you'll get a .gclient file like:
 
     solutions = [
-      { "name"        : "libyuv",
+      { "name"        : "src",
         "url"         : "https://chromium.googlesource.com/libyuv/libyuv",
         "deps_file"   : "DEPS",
         "managed"     : True,
@@ -35,7 +35,7 @@ Browse the Git reprository: https://chromium.googlesource.com/libyuv/libyuv/+/ma
 For Android add `;target_os=['android'];` to your Linux .gclient
 
     solutions = [
-      { "name"        : "libyuv",
+      { "name"        : "src",
         "url"         : "https://chromium.googlesource.com/libyuv/libyuv",
         "deps_file"   : "DEPS",
         "managed"     : True,
@@ -51,14 +51,6 @@ Then run:
     export GYP_DEFINES="OS=android"
     gclient sync
 
-Caveat: Theres an error with Google Play services updates.  If you get the error "Your version of the Google Play services library is not up to date", run the following:
-
-    cd chromium/src
-    ./build/android/play_services/update.py download
-    cd ../..
-
-For Windows the gclient sync must be done from an Administrator command prompt.
-
 The sync will generate native build files for your environment using gyp (Windows: Visual Studio, OSX: XCode, Linux: make). This generation can also be forced manually: `gclient runhooks`
 
 To get just the source (not buildable):