Revert "Update system_profile.proto. Populate app_package_name"

This reverts commit c3884364.

Reason for revert: This has unintended consequences for Android Webview. Reverting so that the logic can be updated to not log the field for webview when the CL is relanded.

Original change's description:
> Update system_profile.proto. Populate app_package_name
> 
> Bug: 833214
> Change-Id: I5552bdca37a2e3e20a039b9a0ca316f4480b1217
> Reviewed-on: https://chromium-review.googlesource.com/1010055
> Commit-Queue: Shuo Weng <shuow@google.com>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#551296}

TBR=asvitkine@chromium.org,wychen@chromium.org,shuow@google.com

Change-Id: I3c14d6f4b1a565d651c69be5d11a28959149f0c7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 833214
Reviewed-on: https://chromium-review.googlesource.com/1014205Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551359}

components/metrics/metrics_log.cc

@@ -173,10 +173,6 @@ void MetricsLog::RecordCoreSystemProfile(MetricsServiceClient* client,
 #if defined(OS_ANDROID)
   os->set_build_fingerprint(
       base::android::BuildInfo::GetInstance()->android_build_fp());
-  std::string package_name =
-      base::android::BuildInfo::GetInstance()->package_name();
-  if (package_name != "com.android.chrome")
-    system_profile->set_app_package_name(package_name);
 #endif
 }
 

components/metrics/metrics_log_unittest.cc

@@ -156,8 +156,6 @@ TEST_F(MetricsLogTest, BasicRecord) {
 #if defined(OS_ANDROID)
   system_profile->mutable_os()->set_build_fingerprint(
       base::android::BuildInfo::GetInstance()->android_build_fp());
-  system_profile->set_app_package_name(
-      base::android::BuildInfo::GetInstance()->package_name());
 #endif
 
   // Hard to mock.

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 192562418
-Date: 2018/04/12 UTC
+Version: 191322814
+Date: 2018/04/02 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/system_profile.proto

@@ -15,7 +15,7 @@ import "extension_install.proto";
 
 // Stores information about the user's brower and system configuration.
 // The system configuration fields are recorded once per client session.
-// Next tag: 27
+// Next tag: 26
 message SystemProfileProto {
   // The time when the client was compiled/linked, in seconds since the epoch.
   optional int64 build_timestamp = 1;
@@ -972,8 +972,4 @@ message SystemProfileProto {
   // extensions from all fully-initialized profiles. If a single extension is
   // installed in multiple profiles, it will be recorded multiple times.
   repeated ExtensionInstallProto extension_install = 25;
-
-  // The Chrome package name on Android, if it's different from
-  // "com.android.chrome".
-  optional string app_package_name = 26;
 }