manifest: only clone latest rev of chromium prebuilts

Change-Id: Iae741ac277e3f97028a05e01897042fb0f79c481
Signed-off-by: Arnav Gupta <championswimmer@gmail.com>
(cherry picked from commit 000464eae4cc137e2d47c0e46b6f45bd936cd167)
diff --git a/default.xml b/default.xml
index 2093022..1c99aea 100644
--- a/default.xml
+++ b/default.xml
@@ -78,7 +78,7 @@
   <project path="external/ceres-solver" name="platform/external/ceres-solver" groups="pdk-cw-fs,pdk-fs" remote="aosp" />
   <project path="external/chromium-libpac" name="platform/external/chromium-libpac" groups="pdk-fs" remote="aosp" />
   <project path="external/chromium-trace" name="platform/external/chromium-trace" groups="pdk" remote="aosp" />
-  <project path="external/chromium-webview" name="platform/external/chromium-webview" groups="pdk" remote="aosp" />
+  <project path="external/chromium-webview" name="platform/external/chromium-webview" groups="pdk" clone-depth="1" remote="aosp" />
   <project path="external/clang" name="platform/external/clang" groups="pdk" remote="aosp" />
   <project path="external/cmockery" name="platform/external/cmockery" groups="pdk-fs" remote="aosp" />
   <project path="external/compiler-rt" name="platform/external/compiler-rt" groups="pdk" remote="aosp" />