Move FilePathWatcher class from browser/... to common/...

chrome/chrome_common.gypi

Index: chrome/chrome_common.gypi
diff --git a/chrome/chrome_common.gypi b/chrome/chrome_common.gypi
index 93e08d85d708b9facea92e63431bb30b9e9db185..646904a06907c926645e4043ce445411a09d9ddb 100644
--- a/chrome/chrome_common.gypi
+++ b/chrome/chrome_common.gypi
@@ -18,6 +18,16 @@
               '<(DEPTH)/third_party/wtl/include',
             ],
           }],
+          ['OS!="linux"', {
+            'sources!': [
+              'common/file_path_watcher/file_path_watcher_inotify.cc',
+            ],
+          }],
+          ['OS=="freebsd" or OS=="openbsd"', {
+            'sources': [
+              'common/file_path_watcher/file_path_watcher_stub.cc',
+            ],
+          }],
         ],
         'sources': [
           # .cc, .h, and .mm files under chrome/common that are used on all
@@ -54,6 +64,11 @@
           'common/devtools_messages.h',
           'common/dom_storage_messages.cc',
           'common/dom_storage_messages.h',
+          'common/file_path_watcher/file_path_watcher.cc',
+          'common/file_path_watcher/file_path_watcher.h',
+          'common/file_path_watcher/file_path_watcher_inotify.cc',
+          'common/file_path_watcher/file_path_watcher_mac.cc',
+          'common/file_path_watcher/file_path_watcher_win.cc',
           'common/font_config_ipc_linux.cc',
           'common/font_config_ipc_linux.h',
           'common/geoposition.cc',