Fix compile on linux_redux bots, caused by http://crrev.com/113808

linux_redux does not have safe_browsing enabled in the GYP variables,
which causes all of chrome/browser/safe_browsing to be excluded from
the chrome_browser target - including safe_browsing_tab_observer.[cc,h]

This enables a stub SafeBrowsingTabObserver to be compiled when
safe_browsing==0, fixing the linker errors from TabContentsWrapper having
a SafeBrowsingTabObserver member.

BUG=none

Review URL: http://codereview.chromium.org/8909017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114553 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/safe_browsing/safe_browsing_tab_observer.cc

@@ -7,7 +7,6 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/safe_browsing/client_side_detection_host.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
@@ -17,8 +16,19 @@
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 
+#if defined(ENABLE_SAFE_BROWSING)
+#include "chrome/browser/safe_browsing/client_side_detection_host.h"
+#endif
+
 namespace safe_browsing {
 
+#if !defined(ENABLE_SAFE_BROWSING)
+// Provide a dummy implementation so that scoped_ptr<ClientSideDetectionHost>
+// has a concrete destructor to call. This is necessary because it is used
+// as a member of SafeBrowsingTabObserver, even if it only ever contains NULL.
+class ClientSideDetectionHost { };
+#endif
+
 SafeBrowsingTabObserver::SafeBrowsingTabObserver(
     TabContentsWrapper* wrapper) : wrapper_(wrapper) {
 #if defined(ENABLE_SAFE_BROWSING)

chrome/chrome_browser.gypi

@@ -4190,6 +4190,8 @@
           ],
           'sources/': [
             ['exclude', '^browser/safe_browsing/'],
+            ['include', '^browser/safe_browsing/safe_browsing_tab_observer.cc'],
+            ['include', '^browser/safe_browsing/safe_browsing_tab_observer.h'],
           ],
         }],
         ['chromeos==0', {