Upgrade python/google-api-python-client to v1.7.8

Test: build
Change-Id: I78a3fbadfee360f092ef9bb73c6e3a1fd23af6e4
diff --git a/METADATA b/METADATA
index 2b18331..616b802 100644
--- a/METADATA
+++ b/METADATA
@@ -1,6 +1,5 @@
-name : "google-api-python-client"
-description:
-    "This is the Python client library for Google's discovery based APIs."
+name: "google-api-python-client"
+description: "This is the Python client library for Google\'s discovery based APIs."
 third_party {
   url {
     type: HOMEPAGE
@@ -10,6 +9,10 @@
     type: GIT
     value: "https://github.com/google/google-api-python-client"
   }
-  version: "1.5.1"
-  last_upgrade_date { year: 2018 month: 6 day: 1 }
+  version: "v1.7.8"
+  last_upgrade_date {
+    year: 2019
+    month: 2
+    day: 1
+  }
 }