Removed all defaults in DeviceReportingProto,

These defaults are misleading, since those of them that were different
from 'false' were ignored everywhere.
According to code search, the code in Chrome and ChromeOs always looks
like:

if (proto.has_PROPERTY()) {
  ... = proto.PROPERTY();
}

or

if (!proto.has_PROPERTY()) {
  return;
}
... = proto.PROPERTY();

Bug: b:168328072
Bug: 1058092
Change-Id: I2b68ddf4316b3fb10ccccb749cbd4cb915df641a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418989Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Leonid Baraz <lbaraz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808589}

components/policy/proto/chrome_device_policy.proto

@@ -113,33 +113,33 @@ message NetworkHostnameProto {
 
 // Policies to turn on portions of the device status reports.
 message DeviceReportingProto {
-  optional bool report_version_info = 1 [default = true];
-  optional bool report_activity_times = 2 [default = true];
-  optional bool report_boot_mode = 3 [default = true];
-  optional bool report_location = 4 [default = false];
-  optional bool report_network_interfaces = 5 [default = true];
-  optional bool report_users = 6 [default = true];
-  optional bool report_hardware_status = 7 [default = true];
-  optional bool report_session_status = 8 [default = true];
-  optional bool report_os_update_status = 10 [default = false];
-  optional bool report_running_kiosk_app = 11 [default = false];
-  optional bool report_power_status = 12 [default = false];
-  optional bool report_storage_status = 13 [default = false];
-  optional bool report_board_status = 14 [default = false];
-  optional bool report_cpu_info = 15 [default = false];
-  optional bool report_graphics_status = 16 [default = false];
-  optional bool report_crash_report_info = 17 [default = false];
-  optional bool report_timezone_info = 18 [default = false];
-  optional bool report_memory_info = 19 [default = false];
-  optional bool report_backlight_info = 20 [default = false];
-  optional bool report_app_info = 21 [default = false];
-  optional bool report_bluetooth_info = 22 [default = false];
-  optional bool report_fan_info = 23 [default = false];
-  optional bool report_vpd_info = 24 [default = false];
-  optional bool report_system_info = 25 [default = false];
-
-  // Frequency to report device status, default to 3 hours.
-  optional int64 device_status_frequency = 9 [default = 10800000];
+  optional bool report_version_info = 1;
+  optional bool report_activity_times = 2;
+  optional bool report_boot_mode = 3;
+  optional bool report_location = 4;
+  optional bool report_network_interfaces = 5;
+  optional bool report_users = 6;
+  optional bool report_hardware_status = 7;
+  optional bool report_session_status = 8;
+  optional bool report_os_update_status = 10;
+  optional bool report_running_kiosk_app = 11;
+  optional bool report_power_status = 12;
+  optional bool report_storage_status = 13;
+  optional bool report_board_status = 14;
+  optional bool report_cpu_info = 15;
+  optional bool report_graphics_status = 16;
+  optional bool report_crash_report_info = 17;
+  optional bool report_timezone_info = 18;
+  optional bool report_memory_info = 19;
+  optional bool report_backlight_info = 20;
+  optional bool report_app_info = 21;
+  optional bool report_bluetooth_info = 22;
+  optional bool report_fan_info = 23;
+  optional bool report_vpd_info = 24;
+  optional bool report_system_info = 25;
+
+  // Frequency to report device status.
+  optional int64 device_status_frequency = 9;
 }
 
 message EphemeralUsersEnabledProto {