Move user_agent code from webkit/ to content/.

content/content.gyp

Index: content/content.gyp
diff --git a/content/content.gyp b/content/content.gyp
index 1d323520b14605031ec98980d038476598d352c6..3807d4d2d833ed63b131e17bd1d7f7241f2c42d8 100644
--- a/content/content.gyp
+++ b/content/content.gyp
@@ -26,6 +26,44 @@
       'includes': [
         '../build/win_precompile.gypi',
       ],
+      'targets': [
+        {
+          'target_name': 'webkit_version',
+          'type': 'none',
+          'actions': [
+            {
+              'action_name': 'generate_webkit_version',
+              'inputs': [
+                '<(script)',
+                '<(lastchange)',
+                '<(template)',
+              ],
+              'outputs': [
+                '<(SHARED_INTERMEDIATE_DIR)/webkit_version.h',
+              ],
+              'action': ['python',
+                         '<(script)',
+                         '-f', '<(lastchange)',
+                         '<(template)',
+                         '<@(_outputs)',
+              ],
+              'variables': {
+                'script': '<(DEPTH)/build/util/version.py',
+                'lastchange': '<(DEPTH)/build/util/LASTCHANGE.blink',
+                'template': 'build/webkit_version.h.in',
+              },
+            },
+          ],
+          'direct_dependent_settings': {
+            'include_dirs': [
+              '<(SHARED_INTERMEDIATE_DIR)',
+            ],
+          },
+          # Dependents may rely on files generated by this target or one of
+          # its own hard dependencies.
+          'hard_dependency': 1,
+        },
+      ],
     }],
     # In component mode, we build all of content as a single DLL.
     # However, in the static mode, we need to build content as multiple