Remove GTM dependency from iOS breakpad_client.

GTM isn't necessary for iOS's breakpad client.

BUG=339495
TEST=None

Review URL: https://codereview.chromium.org/139203006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251829 0039d316-1c4b-4281-b951-d872f2087c98

breakpad/breakpad.gyp

@@ -707,9 +707,6 @@
         {
           'target_name': 'breakpad_client',
           'type': 'static_library',
-          'dependencies': [
-            '../third_party/google_toolbox_for_mac/google_toolbox_for_mac.gyp:google_toolbox_for_mac',
-          ],
           'sources': [
             'src/client/ios/Breakpad.h',
             'src/client/ios/Breakpad.mm',