Regenerate safebrowsing client (googleapis#5849)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2020-09-03 03:55:09,883 synthtool [DEBUG] > Executing /home/kbuilder/.cache/synthtool/google-api-java-client-services/synth.py.
On branch autosynth-safebrowsing
nothing to commit, working tree clean
2020-09-03 03:55:10,212 synthtool [DEBUG] > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
DEBUG:synthtool:Cloning https://github.com/googleapis/discovery-artifact-manager.git.
2020-09-03 03:55:10,581 synthtool [DEBUG] > Cleaning output directory.
DEBUG:synthtool:Cleaning output directory.
2020-09-03 03:55:10,583 synthtool [DEBUG] > Installing dependencies.
DEBUG:synthtool:Installing dependencies.
2020-09-03 03:55:12,222 synthtool [INFO] > Generating safebrowsing v4.
INFO:synthtool:Generating safebrowsing v4.
2020-09-03 03:55:12,223 synthtool [INFO] > 	1.30.1
INFO:synthtool:	1.30.1
WARNING:root:object without properties Empty: OrderedDict([(u'type', u'object'), (u'description', u'A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); } The JSON representation for `Empty` is empty JSON object `{}`.'), (u'properties', OrderedDict()), (u'id', u'Empty')])
Writing json metadata to clients/google-api-services-safebrowsing/v4.metadata.json
2020-09-03 03:55:12,910 synthtool [DEBUG] > Wrote metadata to clients/google-api-services-safebrowsing/synth.metadata.
DEBUG:synthtool:Wrote metadata to clients/google-api-services-safebrowsing/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/6adb2d69-07c3-4dbb-bd5a-e4fae2984f79/targets

- [ ] To automatically regenerate this PR, check this box.

Author: yoshi-automation

clients/google-api-services-safebrowsing/v4.metadata.json

@@ -2,6 +2,6 @@
   "maven": {
     "groupId": "com.google.apis",
     "artifactId": "google-api-services-safebrowsing",
-    "version": "v4-rev20200825-1.30.10"
+    "version": "v4-rev20200901-1.30.10"
   }
 }

clients/google-api-services-safebrowsing/v4/1.30.1/README.md

@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-safebrowsing</artifactId>
-      <version>v4-rev20200825-1.30.10</version>
+      <version>v4-rev20200901-1.30.10</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  compile 'com.google.apis:google-api-services-safebrowsing:v4-rev20200825-1.30.10'
+  compile 'com.google.apis:google-api-services-safebrowsing:v4-rev20200901-1.30.10'
 }
 ```