Revert of linux_aura: Attempt to green the official builder by reverting unwind support. (https://codereview.chromium.org/141013009/)

Reason for revert:
Didn't actually help with the build failures on Google Chrome Linux.

Original issue's description:
> linux_aura: Attempt to green the official builder by reverting unwind support.
> 
> This effectively reverts in r243919 and r244331 in a desperate attempt
> to fix the tree.
> 
> Build fail output:
> 
> FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/rpm/build.sh -o../out/Release -b ../out/Release -a ia32 -c beta
> Staging common install files in '/tmp/rpm.build.XtJRbJ'...
> eu-strip: while computing checksum for debug information: Invalid argument
> FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/rpm/build.sh -o../out/Release -b ../out/Release -a ia32 -c unstable
> Staging common install files in '/tmp/rpm.build.t4jNp4'...
> eu-strip: while computing checksum for debug information: Invalid argument
> FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/debian/build.sh -o../out/Release -b ../out/Release -a ia32 -c unstable
> Staging common install files in '/tmp/deb.build.CxnH9l'...
> eu-strip: while computing checksum for debug information: Invalid argument
> Cleaning...
> FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/debian/build.sh -o../out/Release -b ../out/Release -a ia32 -c stable
> Staging common install files in '/tmp/deb.build.9Zyie1'...
> eu-strip: while computing checksum for debug information: Invalid argument
> Cleaning...
> FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/debian/build.sh -o../out/Release -b ../out/Release -a ia32 -c beta
> Staging common install files in '/tmp/deb.build.xUB39X'...
> eu-strip: while computing checksum for debug information: Invalid argument
> Cleaning...
> FAILED: cd ../../chrome; flock -- /tmp/linux_package_lock bash ../out/Release/installer/rpm/build.sh -o../out/Release -b ../out/Release -a ia32 -c stable
> Staging common install files in '/tmp/rpm.build.aN0PGV'...
> eu-strip: while computing checksum for debug information: Invalid argument
> ../out/Release/chrome, section '.eh_frame': the call frame entry at offset 0x18 uses a DWARF expression to describe how to recover register '.cfa',  but this translator cannot yet translate DWARF expressions to Breakpad postfix expressions
> ninja: build stopped: subcommand failed.
> 
> BUG=180975
> TBR=spang@chromium.org, stip@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245421

TBR=spang@chromium.org,stip@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=180975

Review URL: https://codereview.chromium.org/141273005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245428 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245428