Remove the web-ui task manager unused stuffs for non-ChromeOS.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 1950a9949708f8d5af40aebb65c137a1a71b5440..d361a508198356ef94013800c7a8ef86b32beab0 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -4142,6 +4142,12 @@
           'sources/': [
             ['exclude', '^browser/task_manager/'],
             ['exclude', '^browser/ui/webui/task_manager/'],
+            ['exclude', '^browser/ui/views/task_manager_view.cc'],
+            ['exclude', '^browser/ui/views/task_manager_view.h'],
+            ['exclude', '^browser/ui/cocoa/task_manager_mac.h'],
+            ['exclude', '^browser/ui/cocoa/task_manager_mac.mm'],
+            ['exclude', '^browser/ui/gtk/task_manager_gtk.cc'],
+            ['exclude', '^browser/ui/gtk/task_manager_gtk.h'],
           ],
         }],
         ['disable_nacl==0', {
@@ -4440,6 +4446,10 @@
               ],
             }],
           ],
+        }, { # else: use_aura==0
+          'sources/': [
+            ['exclude', '^browser/ui/webui/task_manager/'],
+          ],
         }],
         ['ui_compositor_image_transport==1', {
           'dependencies': [