Disable deprecation warnings for CUPS as the compile fails when using CUPS 1.6

printing/printing.gyp

Index: printing/printing.gyp
diff --git a/printing/printing.gyp b/printing/printing.gyp
index 8490a03b3fcd89b6c64bf22c2554a84dbf04b816..be4d88356d6100948a6525112e6934ad92bd4d74 100644
--- a/printing/printing.gyp
+++ b/printing/printing.gyp
@@ -162,12 +162,23 @@
           'dependencies': [
             'cups',
           ],
+          'variables': {
+            'cups_version': '<!(cups-config --api-version)',
+          },
           'conditions': [
             ['OS!="mac"', {
               'dependencies': [
                 '../build/linux/system.gyp:libgcrypt',
               ],
             }],
+            ['cups_version=="1.6"', {
+              'cflags': [
+                # CUPS 1.6 deprecated the PPD APIs, but we will stay with this
+                # API for now as supported Linux and Mac OS'es are still using
+                # older versions of CUPS. More info: crbug.com/226176
+                '-Wno-deprecated-declarations',
+              ],
+            }],
           ],
           'defines': [
             # PRINT_BACKEND_AVAILABLE disables the default dummy implementation