Optimize all images and PDFs in chrome/app/theme/....

chrome/app/theme/speech_input_mic_full.png

Index: chrome/app/theme/speech_input_mic_full.png
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--- chrome/app/theme/speech_input_mic_full.png	(revision 77276)
+++ chrome/app/theme/speech_input_mic_full.png	(working copy)
@@ -1,9 +1,5 @@
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