fix signed warning errors in unittests

A bunch of gtest assert statements fail due to signed warnings as
unadorned constants are treated as signed integers.  Mark them all
unsigned to avoid that.

One example (focus on the "[with ...]" blocks that show the types):
In file included from src/breakpad_googletest_includes.h:33:0,
                 from src/common/memory_unittest.cc:30:
src/testing/gtest/include/gtest/gtest.h: In instantiation of 'testing::AssertionResult testing::internal::CmpHelperEQ(const char*, const char*, const T1&, const T2&) [with T1 = int; T2 = long unsigned int]':
src/testing/gtest/include/gtest/gtest.h:1524:23: required from 'static testing::AssertionResult testing::internal::EqHelper<true>::Compare(const char*, const char*, const T1&, const T2&, typename testing::internal::EnableIf<(! testing::internal::is_pointer<T2>::value)>::type*) [with T1 = int; T2 = long unsigned int; typename testing::internal::EnableIf<(! testing::internal::is_pointer<T2>::value)>::type = void]'
src/common/memory_unittest.cc:41:246: required from here
src/testing/gtest/include/gtest/gtest.h:1448:16: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
   if (expected == actual) {
                ^
cc1plus: some warnings being treated as errors
Makefile:5180: recipe for target 'src/common/src_client_linux_linux_client_unittest_shlib-memory_unittest.o' failed
make[2]: *** [src/common/src_client_linux_linux_client_unittest_shlib-memory_unittest.o] Error 1

R=ted.mielczarek@gmail.com

Review URL: https://codereview.chromium.org/2013893003 .

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