Fix PostgreSQL/H2 access under gwtdebug sessions

Unfortunately my recent Maven refactoring series didn't quite work
with the gwtdebug hosted mode debugging support project for gwtui.
The project removes gerrit-pgm (and its contained Jetty) from the
classpath but that was where we were getting our PostgreSQL JDBC
driver from.

We need to import the drivers directly in gwtdebug's own pom.

Change-Id: Iccb284e8f26b1287771e0251dbf2772bbeb43428
Signed-off-by: Shawn O. Pearce <sop@google.com>

gerrit-gwtdebug/pom.xml

diff --git a/gerrit-gwtdebug/pom.xml b/gerrit-gwtdebug/pom.xml
index e868c4e..0516006 100644
--- a/gerrit-gwtdebug/pom.xml
+++ b/gerrit-gwtdebug/pom.xml
@@ -56,6 +56,18 @@
     </dependency>
 
     <dependency>
+      <groupId>com.h2database</groupId>
+      <artifactId>h2</artifactId>
+      <scope>provided</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>postgresql</groupId>
+      <artifactId>postgresql</artifactId>
+      <scope>provided</scope>
+    </dependency>
+
+    <dependency>
       <groupId>bouncycastle</groupId>
       <artifactId>bcprov-jdk15</artifactId>
       <version>140</version>