Suppress uninit read in ToolbarOriginChipView::Update until the bug is fixed

BUG=313788
TBR=gbillock@chromium.org

Review URL: https://codereview.chromium.org/295983004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271727 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions_full.txt

@@ -2170,3 +2170,7 @@ name=bug_374105b
 ...
 gpu.dll!gpu::gles2::ShaderTranslator::GetStringForOptionsThatWouldEffectCompilation
 *!gpu::gles2::ShaderTranslatorTest_OptionsString_Test::TestBody
+
+UNINITIALIZED READ
+name=bug_313788
+*!ToolbarOriginChipView::Update