removes kIsService

I never ended up needing it.

BUG=763529
TEST=none

Change-Id: I4690f87c1979f58c966bd8a5e7cda606616e2320
Reviewed-on: https://chromium-review.googlesource.com/701834Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506756}

content/browser/utility_process_host_impl.cc

@@ -324,7 +324,6 @@ bool UtilityProcessHostImpl::StartProcess() {
 
     const bool is_service = service_identity_.has_value();
     if (is_service) {
-      cmd_line->AppendSwitch(switches::kIsService);
       GetContentClient()->browser()->AdjustUtilityServiceProcessCommandLine(
           *service_identity_, cmd_line.get());
     }

content/public/common/content_switches.cc

@@ -625,9 +625,6 @@ const char kIsolateOrigins[] = "isolate-origins";
 // Chrome is running in Mash.
 const char kIsRunningInMash[] = "is-running-in-mash";
 
-// If true indicates the process was created to host a service.
-const char kIsService[] = "is-service";
-
 // Disable latest shipping ECMAScript 6 features.
 const char kDisableJavaScriptHarmonyShipping[] =
     "disable-javascript-harmony-shipping";

content/public/common/content_switches.h

@@ -187,7 +187,6 @@ CONTENT_EXPORT extern const char kInProcessGPU[];
 CONTENT_EXPORT extern const char kIPCConnectionTimeout[];
 CONTENT_EXPORT extern const char kIsolateOrigins[];
 CONTENT_EXPORT extern const char kIsRunningInMash[];
-CONTENT_EXPORT extern const char kIsService[];
 CONTENT_EXPORT extern const char kJavaScriptFlags[];
 CONTENT_EXPORT extern const char kJavaScriptHarmony[];
 CONTENT_EXPORT extern const char kLogGpuControlListDecisions[];