Revert "Revert PowerSaveBlockerLinux [2/4]"

This reverts commit bbfce899.

Reason for revert: Issue should be fixed after https://chromium-review.googlesource.com/c/chromium/src/+/1937507/ lands

Original change's description:
> Revert  PowerSaveBlockerLinux [2/4]
> 
> and the subsequent  PowerSaveBlockerLinux [3/4] and  PowerSaveBlockerLinux [4/4] patches
> 
> This reverts commit 2fdeba1b. ("Rewrite PowerSaveBlockerLinux [2/4]")
> This reverts commit 38fdf074. ("Rewrite PowerSaveBlockerLinux [3/4]")
> This reverts commit 3bc463b4. ("Rewrite PowerSaveBlockerLinux [4/4]")
> 
> The patch caused timeouts in WakeLockTest.ChangeType() and other tests in the services_unittests on
> Linux Tests (dbg). More details in crbug/1027852.
> 
> TBR=thomasanderson@chromium.org
> 
> Bug: 1013812,1027852
> Change-Id: I7688c72f9d9d6c12ff3731f3abde6a05508cfbeb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1932357
> Commit-Queue: Tim Schumann <tschumann@chromium.org>
> Reviewed-by: Tim Schumann <tschumann@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#718447}

TBR=thomasanderson@chromium.org,tschumann@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1013812, 1027852
Change-Id: I84a6681cc8ec347587d38f0f5f38ed628e624274
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937509Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720760}

services/device/wake_lock/power_save_blocker/BUILD.gn

@@ -22,12 +22,6 @@ source_set("power_save_blocker") {
 
   sources = [
     "power_save_blocker.h",
-    "power_save_blocker_android.cc",
-    "power_save_blocker_chromeos.cc",
-    "power_save_blocker_mac.cc",
-    "power_save_blocker_stub.cc",
-    "power_save_blocker_win.cc",
-    "power_save_blocker_x11.cc",
   ]
 
   public_deps = [
@@ -42,48 +36,40 @@ source_set("power_save_blocker") {
     deps += [ "//dbus" ]
   }
 
-  if (use_x11) {
-    configs += [ "//build/config/linux:x11" ]
-    if (!is_chromeos) {
-      configs += [ "//build/config/linux:xscrnsaver" ]
-    }
-    deps += [
-      "//ui/gfx",
-      "//ui/gfx/x",
-    ]
-  }
-
-  # Dealing with power_save_blocker_{x11,stub}.cc is a little complicated
-  # given the interaction between os_chromeos and the feature flags for X11 and
-  # ozone, so do it all in one spot.
-  #
-  # stub implementation is only used at the moment non-chromeOS Ozone platforms
-  # such as Chromecast.
-  if (is_chromeos || !use_ozone) {
-    sources -= [ "power_save_blocker_stub.cc" ]
-  }
-
-  if (is_chromeos || !use_x11 || !use_dbus) {
-    sources -= [ "power_save_blocker_x11.cc" ]
-  }
-
   if (is_android) {
+    sources += [ "power_save_blocker_android.cc" ]
     deps += [ ":jni_headers" ]
     public_deps += [ "//ui/android" ]
-  }
-
-  if (is_chromeos) {
+  } else if (is_chromeos) {
+    sources += [ "power_save_blocker_chromeos.cc" ]
     deps += [
       "//chromeos/dbus/power",
       "//chromeos/dbus/power:power_manager_proto",
     ]
-  }
-
-  if (is_mac) {
+  } else if (is_linux && use_dbus) {
+    sources += [ "power_save_blocker_linux.cc" ]
+    deps += [
+      "//dbus",
+      "//ui/gfx",
+    ]
+    if (use_x11) {
+      configs += [
+        "//build/config/linux:x11",
+        "//build/config/linux:xscrnsaver",
+      ]
+      deps += [ "//ui/gfx/x" ]
+    }
+  } else if (is_mac) {
+    sources += [ "power_save_blocker_mac.cc" ]
     libs = [
       "CoreFoundation.framework",
       "IOKit.framework",
     ]
+  } else if (is_win) {
+    sources += [ "power_save_blocker_win.cc" ]
+  } else {
+    # Fuchsia and non-DBus Linux.
+    sources += [ "power_save_blocker_stub.cc" ]
   }
 }
 

services/device/wake_lock/power_save_blocker/power_save_blocker.h

@@ -61,13 +61,6 @@ class PowerSaveBlocker {
   // };
   scoped_refptr<Delegate> delegate_;
 
-#if defined(USE_X11)
-  // Since display sleep prevention also implies system suspend prevention, for
-  // the Linux FreeDesktop API case, there needs to be a second delegate to
-  // block system suspend when screen saver / display sleep is blocked.
-  scoped_refptr<Delegate> freedesktop_suspend_delegate_;
-#endif
-
   scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;