Do not use $ANDROID_TOOLCHAIN set by envsetup.sh.

Do not use $ANDROID_TOOLCHAIN set by envsetup.sh.

This reverts the changes from commit 6394facfcd6150a69be418212f1caff2f6639540
and instead improves the adb_gdb script to properly auto-detect the right
location of the toolchain binaries.

This means that on a Linux 64-bit systems, it will first try to find the
64-bit binaries, and if not available, will fallback to 32-bit ones.

Tested with the default toolchain from third_party/android_tools/ndk/
(64-bit) and with --ndk-dir=/path/to/android-ndk-r8d (32-bit).

Also remove "gdb_apk" and "gdb_content_shell" which were obsoleted by
"adb_gdb" and "adb_gdb_content_shell", respectively.

BUG=none
R=yfriedman@chromium.org,navabi@chromium.org,wangxianzhu@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=200547

[Xianzhu, 2013-05-13 16:05:10]

Will $ANDROID_TOOLCHAIN set by envsetup.sh be incorrect? If yes, why don't we
fix envsetup.sh?

[Xianzhu, 2013-05-13 16:07:36]

On 2013/05/13 16:05:10, Xianzhu wrote:
> Will $ANDROID_TOOLCHAIN set by envsetup.sh be incorrect? If yes, why don't we
> fix envsetup.sh?

Never mind, just saw your comment to my patch :)

[Xianzhu, 2013-05-13 16:08:37]

lgtm

[Yaron, 2013-05-13 16:15:07]

lgtm

[commit-bot: I haz the power, 2013-05-13 16:17:07]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/digit@chromium.org/14910010/1

[commit-bot: I haz the power, 2013-05-13 17:05:50]

Retried try job too often on linux_rel for step(s) interactive_ui_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-05-16 13:34:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/digit@chromium.org/14910010/1

[commit-bot: I haz the power, 2013-05-16 16:19:42]

Change committed as 200547