Get rid of a bunch of view_messages.h includes from chrome by making the TabContentsObserver inte...

chrome/browser/DEPS

 include_rules = [
   "+chrome/app",
   "+chrome/app/locales",
   "+chrome/installer",
   "+chrome/personalization",
   "+chrome/profile_import",
   "+chrome/tools/profiles",  # For history unit tests.
   "+chrome/views",
   "+content/plugin/plugin_interpose_util_mac.h",
   "+content/public/browser",
@@ skipping 30 matching lines @@
   "-content/common/desktop_notification_messages.h",
   "-content/common/device_orientation_messages.h",
   # TODO(pfeldman) "-content/common/dom_storage_messages.h",
   "-content/common/dom_storage_messages.h",
   "-content/common/drag_messages.h",
   "-content/common/file_system_messages.h",
   "-content/common/file_utilities_messages.h",
   "-content/common/gamepad_messages.h",
   # TODO(jam) "-content/common/geolocation_messages.h",
   "-content/common/indexed_db_messages.h",
-  "-content/common/intents_messages.h",
+  # TODO(jam) "-content/common/intents_messages.h",
   "-content/common/java_bridge_messages.h",
   "-content/common/mime_registry_messages.h",
   "-content/common/p2p_messages.h",
   "-content/common/pepper_file_messages.h",
   "-content/common/pepper_messages.h",
   "-content/common/plugin_messages.h",
   "-content/common/quota_messages.h",
   "-content/common/resource_messages.h",
   "-content/common/socket_stream_messages.h",
   "-content/common/speech_input_messages.h",
@@ skipping 17 matching lines @@
   "+third_party/libjingle",
   "+third_party/protobuf/src/google/protobuf",
   "+third_party/sqlite",
   "+third_party/undoview",
   "+v8/include",  # Browser uses V8 to get the version and run the debugger.
 
   # FIXME: these should probably not be here, we need to find a better
   # structure for these includes.
   "+chrome/renderer",
 ]