Revert 230780 "Add a step to generate breakpad symbols for conte..."

Broke CrOS build. Likely needs to be configured to support building
a #host binary.  Error message:

  gyp: Dependency '/home/chrome-bot/chrome_root/src/breakpad/breakpad.gyp:dump_syms#host' not found while trying to load target /home/chrome-bot/chrome_root/src/content/content_shell_and_tests.gyp:content_shell_symbols#target


> Add a step to generate breakpad symbols for content shell on linux
> 
> BUG=247431
> R=rsesek@chromium.org
> 
> Review URL: https://codereview.chromium.org/39693003

TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/41303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230792 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230792