Remove PLUGINS call sites.

Flash has been deprecated since M87. User-visible code was removed in
M88. In this CL, I remove the last ContentSettingsType::PLUGINS
non-critical call sites.

Bug: 1149393
Change-Id: I6436e9d3c34f6dfd578538e6a1e7df06ae3bbffe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584163
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837690}

chrome/browser/ui/browser_content_setting_bubble_model_delegate.cc

@@ -53,9 +53,6 @@ void BrowserContentSettingBubbleModelDelegate::ShowLearnMorePage(
     ContentSettingsType type) {
   GURL learn_more_url;
   switch (type) {
-    case ContentSettingsType::PLUGINS:
-      learn_more_url = GURL(chrome::kBlockedPluginLearnMoreURL);
-      break;
     case ContentSettingsType::ADS:
       learn_more_url = GURL(subresource_filter::kLearnMoreLink);
       break;

chrome/browser/ui/views/page_info/page_info_bubble_view_unittest.cc

@@ -229,39 +229,6 @@ class PageInfoBubbleViewTest : public testing::Test {
   DISALLOW_COPY_AND_ASSIGN(PageInfoBubbleViewTest);
 };
 
-#if BUILDFLAG(ENABLE_PLUGINS)
-// Waits until a change is observed in content settings.
-class FlashContentSettingsChangeWaiter : public content_settings::Observer {
- public:
-  explicit FlashContentSettingsChangeWaiter(Profile* profile)
-      : profile_(profile) {
-    HostContentSettingsMapFactory::GetForProfile(profile)->AddObserver(this);
-  }
-  ~FlashContentSettingsChangeWaiter() override {
-    HostContentSettingsMapFactory::GetForProfile(profile_)->RemoveObserver(
-        this);
-  }
-
-  // content_settings::Observer:
-  void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
-                               const ContentSettingsPattern& secondary_pattern,
-                               ContentSettingsType content_type) override {
-    if (content_type == ContentSettingsType::PLUGINS)
-      Proceed();
-  }
-
-  void Wait() { run_loop_.Run(); }
-
- private:
-  void Proceed() { run_loop_.Quit(); }
-
-  Profile* profile_;
-  base::RunLoop run_loop_;
-
-  DISALLOW_COPY_AND_ASSIGN(FlashContentSettingsChangeWaiter);
-};
-#endif
-
 }  // namespace
 
 // Each permission selector row is like this: [icon] [label] [selector]

chrome/common/url_constants.cc

@@ -449,9 +449,6 @@ const char kChromeSyncLearnMoreURL[] =
 #endif  // BUILDFLAG(ENABLE_ONE_CLICK_SIGNIN)
 
 #if BUILDFLAG(ENABLE_PLUGINS)
-const char kBlockedPluginLearnMoreURL[] =
-    "https://support.google.com/chrome/?p=ib_blocked_plugin";
-
 const char kOutdatedPluginLearnMoreURL[] =
     "https://support.google.com/chrome/?p=ib_outdated_plugin";
 #endif

chrome/common/url_constants.h

@@ -411,8 +411,6 @@ extern const char kChromeSyncLearnMoreURL[];
 #endif
 
 #if BUILDFLAG(ENABLE_PLUGINS)
-// The URL for the "Learn more" page for the blocked plugin infobar.
-extern const char kBlockedPluginLearnMoreURL[];
 
 // The URL for the "Learn more" page for the outdated plugin infobar.
 extern const char kOutdatedPluginLearnMoreURL[];

components/content_settings/core/browser/content_settings_registry_unittest.cc

@@ -124,7 +124,6 @@ TEST_F(ContentSettingsRegistryTest, Inheritance) {
   // disable features like popup blocking, download blocking or ad blocking.
   // They do not allow access to user data.
   const ContentSettingsType safe_types[] = {
-      ContentSettingsType::PLUGINS,
       ContentSettingsType::POPUPS,
       ContentSettingsType::AUTOMATIC_DOWNLOADS,
       ContentSettingsType::ADS,