Remove non-existing headers from the build

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index c96f62da4149796aaa6b970193c8695531264d90..c5f046b0d6d971581c5cd306f861269bc6bb0db1 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -166,7 +166,6 @@ split_static_library("browser") {
     "browsing_data/browsing_data_quota_helper.h",
     "browsing_data/browsing_data_quota_helper_impl.cc",
     "browsing_data/browsing_data_quota_helper_impl.h",
-    "browsing_data/browsing_data_remover_delegate.h",
     "browsing_data/browsing_data_service_worker_helper.cc",
     "browsing_data/browsing_data_service_worker_helper.h",
     "browsing_data/cache_counter.cc",
@@ -1316,7 +1315,6 @@ split_static_library("browser") {
     "sync/sync_startup_tracker.h",
     "tab_contents/navigation_metrics_recorder.cc",
     "tab_contents/navigation_metrics_recorder.h",
-    "tab_contents/retargeting_details.h",
     "tab_contents/tab_util.cc",
     "tab_contents/tab_util.h",
     "task_manager/web_contents_tags.cc",
@@ -1990,7 +1988,6 @@ split_static_library("browser") {
     sources += [
       "spellchecker/spellcheck_custom_dictionary.cc",
       "spellchecker/spellcheck_custom_dictionary.h",
-      "spellchecker/spellcheck_dictionary.h",
       "spellchecker/spellcheck_factory.cc",
       "spellchecker/spellcheck_factory.h",
       "spellchecker/spellcheck_hunspell_dictionary.cc",
@@ -2895,7 +2892,6 @@ split_static_library("browser") {
       "android/offline_pages/offline_page_tab_helper.h",
       "android/offline_pages/offline_page_utils.cc",
       "android/offline_pages/offline_page_utils.h",
-      "android/offline_pages/offliner_factory.h",
       "android/offline_pages/offliner_helper.cc",
       "android/offline_pages/offliner_helper.h",
       "android/offline_pages/prerender_adapter.cc",