Remove gtest and gmock in favor of googletest.

Test: make tests # make checkbuild broken by http://b/30297337
Bug: http://b/16574165
Change-Id: Ifcaf63648b93b7a9f6e6e7a9028e4a4d4662969e

default.xml

@@ -135,7 +135,6 @@
   <project path="external/gemmlowp" name="platform/external/gemmlowp" groups="pdk" />
   <project path="external/giflib" name="platform/external/giflib" groups="pdk,qcom_msm8x26" />
   <project path="external/glide" name="platform/external/glide" groups="pdk" />
-  <project path="external/gmock" name="platform/external/gmock" groups="pdk" />
   <project path="external/google-benchmark" name="platform/external/google-benchmark" groups="pdk" />
   <project path="external/google-breakpad" name="platform/external/google-breakpad" groups="dragon,pdk-fs" />
   <project path="external/google-fonts/carrois-gothic-sc" name="platform/external/google-fonts/carrois-gothic-sc" groups="pdk" />
@@ -145,7 +144,6 @@
   <project path="external/google-tv-pairing-protocol" name="platform/external/google-tv-pairing-protocol" groups="pdk" />
   <project path="external/googletest" name="platform/external/googletest" groups="pdk" />
   <project path="external/gptfdisk" name="platform/external/gptfdisk" groups="pdk" />
-  <project path="external/gtest" name="platform/external/gtest" groups="pdk" />
   <project path="external/guava" name="platform/external/guava" groups="pdk" />
   <project path="external/guice" name="platform/external/guice" groups="pdk" />
   <project path="external/hamcrest" name="platform/external/hamcrest" groups="pdk" />