Remove local printer handler lacros

Use the local printer mojom interface for both the ash and lacros
printer handler implementations. Ash chrome uses the LocalPrinterAsh
class directly while lacros chrome uses a mojo remote to call methods.

Update unit tests for local printer handler chromeos.

Bug: b/179305359
Change-Id: Ifea2ed10adb7e24c56bd001ba3fa131e57595e4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2912948
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Pranav Batra <batrapranav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#892765}

chrome/BUILD.gn

@@ -481,9 +481,7 @@ if (is_win) {
       # executable because dlopen() and loading all the dependent dylibs
       # is time-consuming, see https://crbug.com/1197495.
       deps += [ ":chrome_framework+link" ]
-      ldflags = [
-        "-Wl,-rpath,@executable_path/../Frameworks",
-      ]
+      ldflags = [ "-Wl,-rpath,@executable_path/../Frameworks" ]
 
       # The Framework is packaged inside the .app bundle. But when using the
       # component build, all the dependent shared libraries of :chrome_dll are
@@ -1352,7 +1350,7 @@ group("browser_dependencies") {
 
   if (enable_basic_printing) {
     public_deps += [ "//printing" ]
-    if (enable_print_preview && !is_chromeos_ash) {
+    if (enable_print_preview && !is_chromeos) {
       public_deps += [ "//chrome/service" ]
     }
   }

chrome/app/chrome_main_delegate.cc

@@ -191,7 +191,7 @@ base::LazyInstance<ChromeContentUtilityClient>::DestructorAtExit
 
 extern int NaClMain(const content::MainFunctionParams&);
 
-#if !BUILDFLAG(IS_CHROMEOS_ASH)
+#if !defined(OS_CHROMEOS)
 extern int CloudPrintServiceProcessMain(const content::MainFunctionParams&);
 #endif
 
@@ -1165,7 +1165,7 @@ int ChromeMainDelegate::RunProcess(
   NOTREACHED();  // Android provides a subclass and shares no code here.
 #else
   static const MainFunction kMainFunctions[] = {
-#if BUILDFLAG(ENABLE_PRINT_PREVIEW) && !BUILDFLAG(IS_CHROMEOS_ASH)
+#if BUILDFLAG(ENABLE_PRINT_PREVIEW) && !defined(OS_CHROMEOS)
     {switches::kCloudPrintServiceProcess, CloudPrintServiceProcessMain},
 #endif
 

chrome/browser/ui/BUILD.gn

@@ -4861,21 +4861,11 @@ static_library("ui") {
     ]
 
     if (is_chromeos) {
-      sources += [
-        "webui/print_preview/print_preview_handler_chromeos.cc",
-        "webui/print_preview/print_preview_handler_chromeos.h",
-      ]
-    }
-    if (is_chromeos_lacros) {
-      sources += [
-        "webui/print_preview/local_printer_handler_lacros.cc",
-        "webui/print_preview/local_printer_handler_lacros.h",
-      ]
-    }
-    if (is_chromeos_ash) {
       sources += [
         "webui/print_preview/local_printer_handler_chromeos.cc",
         "webui/print_preview/local_printer_handler_chromeos.h",
+        "webui/print_preview/print_preview_handler_chromeos.cc",
+        "webui/print_preview/print_preview_handler_chromeos.h",
       ]
     } else {
       sources += [