Revert of Reenable linux_aura on the main builders. (Again). (https://codereview.chromium.org/138033023/)

Reason for revert:
Blink layout tests are failing:

http/tests/plugins/interrupted-get-url.html
http/tests/plugins/third-party-cookie-accept-policy.html
plugins/mouse-click-plugin-clears-selection.html

Original issue's description:
> Reenable linux_aura on the main builders. (Again).
> 
> We upgraded the eu-strip binary so that it can deal with binaries that
> are more than two gigabytes large. This should fix the crash on the
> Google Chrome Linux builder, which was the only bot to break last night.
> 
> BUG=319075,125106,303342,318961
> NOTRY=True
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245737

TBR=erg@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=319075,125106,303342,318961

Review URL: https://codereview.chromium.org/143073002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@245865 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -84,14 +84,6 @@
               'use_aura%': 1,
             }],
 
-            # ToT Linux should be aura.
-            #
-            # TODO(erg): Merge this into the previous block once compiling with
-            # aura safely implies including ash capabilities.
-            ['OS=="linux"', {
-              'use_aura%': 1,
-            }],
-
             # Whether we're a traditional desktop unix.
             ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") and chromeos==0', {
               'desktop_linux%': 1,